Ignore:
Timestamp:
Feb 6, 2008, 11:15:29 AM (12 years ago)
Author:
julian.reschke@…
Message:

Add sections that for now normatively reference the ABNF syntax and basic rules from Part1, also start work on referencing ABNF rules adopted from other parts (ongoing); relates to #36.

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  • draft-ietf-httpbis/latest/p3-payload.html

    r204 r205  
    333333      <link rel="Index" href="#rfc.index">
    334334      <link rel="Chapter" title="1 Introduction" href="#rfc.section.1">
    335       <link rel="Chapter" title="2 Protocol Parameters" href="#rfc.section.2">
    336       <link rel="Chapter" title="3 Entity" href="#rfc.section.3">
    337       <link rel="Chapter" title="4 Content Negotiation" href="#rfc.section.4">
    338       <link rel="Chapter" title="5 Header Field Definitions" href="#rfc.section.5">
    339       <link rel="Chapter" title="6 IANA Considerations" href="#rfc.section.6">
    340       <link rel="Chapter" title="7 Security Considerations" href="#rfc.section.7">
    341       <link rel="Chapter" title="8 Acknowledgments" href="#rfc.section.8">
    342       <link rel="Chapter" href="#rfc.section.9" title="9 References">
     335      <link rel="Chapter" title="2 Notational Conventions and Generic Grammar" href="#rfc.section.2">
     336      <link rel="Chapter" title="3 Protocol Parameters" href="#rfc.section.3">
     337      <link rel="Chapter" title="4 Entity" href="#rfc.section.4">
     338      <link rel="Chapter" title="5 Content Negotiation" href="#rfc.section.5">
     339      <link rel="Chapter" title="6 Header Field Definitions" href="#rfc.section.6">
     340      <link rel="Chapter" title="7 IANA Considerations" href="#rfc.section.7">
     341      <link rel="Chapter" title="8 Security Considerations" href="#rfc.section.8">
     342      <link rel="Chapter" title="9 Acknowledgments" href="#rfc.section.9">
     343      <link rel="Chapter" href="#rfc.section.10" title="10 References">
    343344      <link rel="Appendix" title="A Differences Between HTTP Entities and RFC 2045 Entities" href="#rfc.section.A">
    344345      <link rel="Appendix" title="B Additional Features" href="#rfc.section.B">
     
    483484            </ul>
    484485         </li>
    485          <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#protocol.parameters">Protocol Parameters</a><ul class="toc">
    486                <li class="tocline1">2.1&nbsp;&nbsp;&nbsp;<a href="#character.sets">Character Sets</a><ul class="toc">
    487                      <li class="tocline1">2.1.1&nbsp;&nbsp;&nbsp;<a href="#missing.charset">Missing Charset</a></li>
     486         <li class="tocline0">2.&nbsp;&nbsp;&nbsp;<a href="#notation">Notational Conventions and Generic Grammar</a></li>
     487         <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#protocol.parameters">Protocol Parameters</a><ul class="toc">
     488               <li class="tocline1">3.1&nbsp;&nbsp;&nbsp;<a href="#character.sets">Character Sets</a><ul class="toc">
     489                     <li class="tocline1">3.1.1&nbsp;&nbsp;&nbsp;<a href="#missing.charset">Missing Charset</a></li>
    488490                  </ul>
    489491               </li>
    490                <li class="tocline1">2.2&nbsp;&nbsp;&nbsp;<a href="#content.codings">Content Codings</a></li>
    491                <li class="tocline1">2.3&nbsp;&nbsp;&nbsp;<a href="#media.types">Media Types</a><ul class="toc">
    492                      <li class="tocline1">2.3.1&nbsp;&nbsp;&nbsp;<a href="#canonicalization.and.text.defaults">Canonicalization and Text Defaults</a></li>
    493                      <li class="tocline1">2.3.2&nbsp;&nbsp;&nbsp;<a href="#multipart.types">Multipart Types</a></li>
     492               <li class="tocline1">3.2&nbsp;&nbsp;&nbsp;<a href="#content.codings">Content Codings</a></li>
     493               <li class="tocline1">3.3&nbsp;&nbsp;&nbsp;<a href="#media.types">Media Types</a><ul class="toc">
     494                     <li class="tocline1">3.3.1&nbsp;&nbsp;&nbsp;<a href="#canonicalization.and.text.defaults">Canonicalization and Text Defaults</a></li>
     495                     <li class="tocline1">3.3.2&nbsp;&nbsp;&nbsp;<a href="#multipart.types">Multipart Types</a></li>
    494496                  </ul>
    495497               </li>
    496                <li class="tocline1">2.4&nbsp;&nbsp;&nbsp;<a href="#quality.values">Quality Values</a></li>
    497                <li class="tocline1">2.5&nbsp;&nbsp;&nbsp;<a href="#language.tags">Language Tags</a></li>
     498               <li class="tocline1">3.4&nbsp;&nbsp;&nbsp;<a href="#quality.values">Quality Values</a></li>
     499               <li class="tocline1">3.5&nbsp;&nbsp;&nbsp;<a href="#language.tags">Language Tags</a></li>
    498500            </ul>
    499501         </li>
    500          <li class="tocline0">3.&nbsp;&nbsp;&nbsp;<a href="#entity">Entity</a><ul class="toc">
    501                <li class="tocline1">3.1&nbsp;&nbsp;&nbsp;<a href="#entity.header.fields">Entity Header Fields</a></li>
    502                <li class="tocline1">3.2&nbsp;&nbsp;&nbsp;<a href="#entity.body">Entity Body</a><ul class="toc">
    503                      <li class="tocline1">3.2.1&nbsp;&nbsp;&nbsp;<a href="#type">Type</a></li>
    504                      <li class="tocline1">3.2.2&nbsp;&nbsp;&nbsp;<a href="#entity.length">Entity Length</a></li>
     502         <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#entity">Entity</a><ul class="toc">
     503               <li class="tocline1">4.1&nbsp;&nbsp;&nbsp;<a href="#entity.header.fields">Entity Header Fields</a></li>
     504               <li class="tocline1">4.2&nbsp;&nbsp;&nbsp;<a href="#entity.body">Entity Body</a><ul class="toc">
     505                     <li class="tocline1">4.2.1&nbsp;&nbsp;&nbsp;<a href="#type">Type</a></li>
     506                     <li class="tocline1">4.2.2&nbsp;&nbsp;&nbsp;<a href="#entity.length">Entity Length</a></li>
    505507                  </ul>
    506508               </li>
    507509            </ul>
    508510         </li>
    509          <li class="tocline0">4.&nbsp;&nbsp;&nbsp;<a href="#content.negotiation">Content Negotiation</a><ul class="toc">
    510                <li class="tocline1">4.1&nbsp;&nbsp;&nbsp;<a href="#server-driven.negotiation">Server-driven Negotiation</a></li>
    511                <li class="tocline1">4.2&nbsp;&nbsp;&nbsp;<a href="#agent-driven.negotiation">Agent-driven Negotiation</a></li>
    512                <li class="tocline1">4.3&nbsp;&nbsp;&nbsp;<a href="#transparent.negotiation">Transparent Negotiation</a></li>
     511         <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#content.negotiation">Content Negotiation</a><ul class="toc">
     512               <li class="tocline1">5.1&nbsp;&nbsp;&nbsp;<a href="#server-driven.negotiation">Server-driven Negotiation</a></li>
     513               <li class="tocline1">5.2&nbsp;&nbsp;&nbsp;<a href="#agent-driven.negotiation">Agent-driven Negotiation</a></li>
     514               <li class="tocline1">5.3&nbsp;&nbsp;&nbsp;<a href="#transparent.negotiation">Transparent Negotiation</a></li>
    513515            </ul>
    514516         </li>
    515          <li class="tocline0">5.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
    516                <li class="tocline1">5.1&nbsp;&nbsp;&nbsp;<a href="#header.accept">Accept</a></li>
    517                <li class="tocline1">5.2&nbsp;&nbsp;&nbsp;<a href="#header.accept-charset">Accept-Charset</a></li>
    518                <li class="tocline1">5.3&nbsp;&nbsp;&nbsp;<a href="#header.accept-encoding">Accept-Encoding</a></li>
    519                <li class="tocline1">5.4&nbsp;&nbsp;&nbsp;<a href="#header.accept-language">Accept-Language</a></li>
    520                <li class="tocline1">5.5&nbsp;&nbsp;&nbsp;<a href="#header.content-encoding">Content-Encoding</a></li>
    521                <li class="tocline1">5.6&nbsp;&nbsp;&nbsp;<a href="#header.content-language">Content-Language</a></li>
    522                <li class="tocline1">5.7&nbsp;&nbsp;&nbsp;<a href="#header.content-location">Content-Location</a></li>
    523                <li class="tocline1">5.8&nbsp;&nbsp;&nbsp;<a href="#header.content-md5">Content-MD5</a></li>
    524                <li class="tocline1">5.9&nbsp;&nbsp;&nbsp;<a href="#header.content-type">Content-Type</a></li>
     517         <li class="tocline0">6.&nbsp;&nbsp;&nbsp;<a href="#header.fields">Header Field Definitions</a><ul class="toc">
     518               <li class="tocline1">6.1&nbsp;&nbsp;&nbsp;<a href="#header.accept">Accept</a></li>
     519               <li class="tocline1">6.2&nbsp;&nbsp;&nbsp;<a href="#header.accept-charset">Accept-Charset</a></li>
     520               <li class="tocline1">6.3&nbsp;&nbsp;&nbsp;<a href="#header.accept-encoding">Accept-Encoding</a></li>
     521               <li class="tocline1">6.4&nbsp;&nbsp;&nbsp;<a href="#header.accept-language">Accept-Language</a></li>
     522               <li class="tocline1">6.5&nbsp;&nbsp;&nbsp;<a href="#header.content-encoding">Content-Encoding</a></li>
     523               <li class="tocline1">6.6&nbsp;&nbsp;&nbsp;<a href="#header.content-language">Content-Language</a></li>
     524               <li class="tocline1">6.7&nbsp;&nbsp;&nbsp;<a href="#header.content-location">Content-Location</a></li>
     525               <li class="tocline1">6.8&nbsp;&nbsp;&nbsp;<a href="#header.content-md5">Content-MD5</a></li>
     526               <li class="tocline1">6.9&nbsp;&nbsp;&nbsp;<a href="#header.content-type">Content-Type</a></li>
    525527            </ul>
    526528         </li>
    527          <li class="tocline0">6.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a></li>
    528          <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul class="toc">
    529                <li class="tocline1">7.1&nbsp;&nbsp;&nbsp;<a href="#privacy.issues.connected.to.accept.headers">Privacy Issues Connected to Accept Headers</a></li>
    530                <li class="tocline1">7.2&nbsp;&nbsp;&nbsp;<a href="#content-disposition.issues">Content-Disposition Issues</a></li>
     529         <li class="tocline0">7.&nbsp;&nbsp;&nbsp;<a href="#IANA.considerations">IANA Considerations</a></li>
     530         <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#security.considerations">Security Considerations</a><ul class="toc">
     531               <li class="tocline1">8.1&nbsp;&nbsp;&nbsp;<a href="#privacy.issues.connected.to.accept.headers">Privacy Issues Connected to Accept Headers</a></li>
     532               <li class="tocline1">8.2&nbsp;&nbsp;&nbsp;<a href="#content-disposition.issues">Content-Disposition Issues</a></li>
    531533            </ul>
    532534         </li>
    533          <li class="tocline0">8.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
    534          <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul class="toc">
    535                <li class="tocline1">9.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
    536                <li class="tocline1">9.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
     535         <li class="tocline0">9.&nbsp;&nbsp;&nbsp;<a href="#ack">Acknowledgments</a></li>
     536         <li class="tocline0">10.&nbsp;&nbsp;&nbsp;<a href="#rfc.references">References</a><ul class="toc">
     537               <li class="tocline1">10.1&nbsp;&nbsp;&nbsp;<a href="#rfc.references.1">Normative References</a></li>
     538               <li class="tocline1">10.2&nbsp;&nbsp;&nbsp;<a href="#rfc.references.2">Informative References</a></li>
    537539            </ul>
    538540         </li>
     
    582584      <p id="rfc.section.1.1.p.2">An implementation is not compliant if it fails to satisfy one or more of the <em class="bcp14">MUST</em> or <em class="bcp14">REQUIRED</em> level requirements for the protocols it implements. An implementation that satisfies all the <em class="bcp14">MUST</em> or <em class="bcp14">REQUIRED</em> level and all the <em class="bcp14">SHOULD</em> level requirements for its protocols is said to be "unconditionally compliant"; one that satisfies all the <em class="bcp14">MUST</em> level requirements but not all the <em class="bcp14">SHOULD</em> level requirements for its protocols is said to be "conditionally compliant."
    583585      </p>
    584       <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
    585       <h2 id="rfc.section.2.1"><a href="#rfc.section.2.1">2.1</a>&nbsp;<a id="character.sets" href="#character.sets">Character Sets</a></h2>
    586       <p id="rfc.section.2.1.p.1">HTTP uses the same definition of the term "character set" as that described for MIME:</p>
    587       <p id="rfc.section.2.1.p.2">The term "character set" is used in this document to refer to a method used with one or more tables to convert a sequence
     586      <h1 id="rfc.section.2"><a href="#rfc.section.2">2.</a>&nbsp;<a id="notation" href="#notation">Notational Conventions and Generic Grammar</a></h1>
     587      <p id="rfc.section.2.p.1">This specification uses the ABNF syntax defined in <a href="p1-messaging.html#notation.abnf" title="Augmented BNF">Section 2.1</a> of <a href="#Part1" id="rfc.xref.Part1.1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> and the core rules defined in <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>: <span class="comment">[abnf.dep: ABNF syntax and basic rules will be adopted from RFC 5234, see &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/36">http://tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;.]</span>
     588      </p>
     589      <div id="rfc.figure.u.1"></div><pre class="inline">  ALPHA         = &lt;ALPHA, defined in <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     590  DIGIT         = &lt;DIGIT, defined in <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     591  OCTET         = &lt;OCTET, defined in <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     592</pre><div id="rfc.figure.u.2"></div><pre class="inline">  quoted-string = &lt;quoted-string, defined in <a href="#Part1" id="rfc.xref.Part1.6"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     593  token         = &lt;token, defined in <a href="#Part1" id="rfc.xref.Part1.7"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#basic.rules" title="Basic Rules">Section 2.2</a>&gt;
     594</pre><h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="protocol.parameters" href="#protocol.parameters">Protocol Parameters</a></h1>
     595      <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="character.sets" href="#character.sets">Character Sets</a></h2>
     596      <p id="rfc.section.3.1.p.1">HTTP uses the same definition of the term "character set" as that described for MIME:</p>
     597      <p id="rfc.section.3.1.p.2">The term "character set" is used in this document to refer to a method used with one or more tables to convert a sequence
    588598         of octets into a sequence of characters. Note that unconditional conversion in the other direction is not required, in that
    589599         not all characters may be available in a given character set and a character set may provide more than one sequence of octets
     
    598608         </dd>
    599609      </dl>
    600       <p id="rfc.section.2.1.p.4">HTTP character sets are identified by case-insensitive tokens. The complete set of tokens is defined by the IANA Character
     610      <p id="rfc.section.3.1.p.4">HTTP character sets are identified by case-insensitive tokens. The complete set of tokens is defined by the IANA Character
    601611         Set registry (&lt;<a href="http://www.iana.org/assignments/character-sets">http://www.iana.org/assignments/character-sets</a>&gt;).
    602612      </p>
    603       <div id="rfc.figure.u.1"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  charset = token
    604 </pre><p id="rfc.section.2.1.p.6">Although HTTP allows an arbitrary token to be used as a charset value, any token that has a predefined value within the IANA
     613      <div id="rfc.figure.u.3"></div><pre class="inline"><span id="rfc.iref.g.1"></span>  charset = token
     614</pre><p id="rfc.section.3.1.p.6">Although HTTP allows an arbitrary token to be used as a charset value, any token that has a predefined value within the IANA
    605615         Character Set registry <em class="bcp14">MUST</em> represent the character set defined by that registry. Applications <em class="bcp14">SHOULD</em> limit their use of character sets to those defined by the IANA registry.
    606616      </p>
    607       <p id="rfc.section.2.1.p.7">HTTP uses charset in two contexts: within an Accept-Charset request header (in which the charset value is an unquoted token)
     617      <p id="rfc.section.3.1.p.7">HTTP uses charset in two contexts: within an Accept-Charset request header (in which the charset value is an unquoted token)
    608618         and as the value of a parameter in a Content-Type header (within a request or response), in which case the parameter value
    609619         of the charset parameter may be quoted.
    610620      </p>
    611       <p id="rfc.section.2.1.p.8">Implementors should be aware of IETF character set requirements <a href="#RFC3629" id="rfc.xref.RFC3629.1"><cite title="UTF-8, a transformation format of ISO 10646">[RFC3629]</cite></a>  <a href="#RFC2277" id="rfc.xref.RFC2277.1"><cite title="IETF Policy on Character Sets and Languages">[RFC2277]</cite></a>.
    612       </p>
    613       <h3 id="rfc.section.2.1.1"><a href="#rfc.section.2.1.1">2.1.1</a>&nbsp;<a id="missing.charset" href="#missing.charset">Missing Charset</a></h3>
    614       <p id="rfc.section.2.1.1.p.1">Some HTTP/1.0 software has interpreted a Content-Type header without charset parameter incorrectly to mean "recipient should
     621      <p id="rfc.section.3.1.p.8">Implementors should be aware of IETF character set requirements <a href="#RFC3629" id="rfc.xref.RFC3629.1"><cite title="UTF-8, a transformation format of ISO 10646">[RFC3629]</cite></a>  <a href="#RFC2277" id="rfc.xref.RFC2277.1"><cite title="IETF Policy on Character Sets and Languages">[RFC2277]</cite></a>.
     622      </p>
     623      <h3 id="rfc.section.3.1.1"><a href="#rfc.section.3.1.1">3.1.1</a>&nbsp;<a id="missing.charset" href="#missing.charset">Missing Charset</a></h3>
     624      <p id="rfc.section.3.1.1.p.1">Some HTTP/1.0 software has interpreted a Content-Type header without charset parameter incorrectly to mean "recipient should
    615625         guess." Senders wishing to defeat this behavior <em class="bcp14">MAY</em> include a charset parameter even when the charset is ISO-8859-1 (<a href="#ISO-8859-1" id="rfc.xref.ISO-8859-1.1"><cite title="Information technology -- 8-bit single-byte coded graphic character sets -- Part 1: Latin alphabet No. 1">[ISO-8859-1]</cite></a>) and <em class="bcp14">SHOULD</em> do so when it is known that it will not confuse the recipient.
    616626      </p>
    617       <p id="rfc.section.2.1.1.p.2">Unfortunately, some older HTTP/1.0 clients did not deal properly with an explicit charset parameter. HTTP/1.1 recipients <em class="bcp14">MUST</em> respect the charset label provided by the sender; and those user agents that have a provision to "guess" a charset <em class="bcp14">MUST</em> use the charset from the content-type field if they support that charset, rather than the recipient's preference, when initially
    618          displaying a document. See <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;2.3.1</a>.
    619       </p>
    620       <h2 id="rfc.section.2.2"><a href="#rfc.section.2.2">2.2</a>&nbsp;<a id="content.codings" href="#content.codings">Content Codings</a></h2>
    621       <p id="rfc.section.2.2.p.1">Content coding values indicate an encoding transformation that has been or can be applied to an entity. Content codings are
     627      <p id="rfc.section.3.1.1.p.2">Unfortunately, some older HTTP/1.0 clients did not deal properly with an explicit charset parameter. HTTP/1.1 recipients <em class="bcp14">MUST</em> respect the charset label provided by the sender; and those user agents that have a provision to "guess" a charset <em class="bcp14">MUST</em> use the charset from the content-type field if they support that charset, rather than the recipient's preference, when initially
     628         displaying a document. See <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;3.3.1</a>.
     629      </p>
     630      <h2 id="rfc.section.3.2"><a href="#rfc.section.3.2">3.2</a>&nbsp;<a id="content.codings" href="#content.codings">Content Codings</a></h2>
     631      <p id="rfc.section.3.2.p.1">Content coding values indicate an encoding transformation that has been or can be applied to an entity. Content codings are
    622632         primarily used to allow a document to be compressed or otherwise usefully transformed without losing the identity of its underlying
    623633         media type and without loss of information. Frequently, the entity is stored in coded form, transmitted directly, and only
    624634         decoded by the recipient.
    625635      </p>
    626       <div id="rfc.figure.u.2"></div><pre class="inline"><span id="rfc.iref.g.2"></span>  content-coding   = token
    627 </pre><p id="rfc.section.2.2.p.3">All content-coding values are case-insensitive. HTTP/1.1 uses content-coding values in the Accept-Encoding (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.1" title="Accept-Encoding">Section&nbsp;5.3</a>) and Content-Encoding (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.1" title="Content-Encoding">Section&nbsp;5.5</a>) header fields. Although the value describes the content-coding, what is more important is that it indicates what decoding
     636      <div id="rfc.figure.u.4"></div><pre class="inline"><span id="rfc.iref.g.2"></span>  content-coding   = token
     637</pre><p id="rfc.section.3.2.p.3">All content-coding values are case-insensitive. HTTP/1.1 uses content-coding values in the Accept-Encoding (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.1" title="Accept-Encoding">Section&nbsp;6.3</a>) and Content-Encoding (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.1" title="Content-Encoding">Section&nbsp;6.5</a>) header fields. Although the value describes the content-coding, what is more important is that it indicates what decoding
    628638         mechanism will be required to remove the encoding.
    629639      </p>
    630       <p id="rfc.section.2.2.p.4">The Internet Assigned Numbers Authority (IANA) acts as a registry for content-coding value tokens. Initially, the registry
     640      <p id="rfc.section.3.2.p.4">The Internet Assigned Numbers Authority (IANA) acts as a registry for content-coding value tokens. Initially, the registry
    631641         contains the following tokens:
    632642      </p>
    633       <p id="rfc.section.2.2.p.5">gzip<span id="rfc.iref.g.3"></span> 
     643      <p id="rfc.section.3.2.p.5">gzip<span id="rfc.iref.g.3"></span> 
    634644      </p>
    635645      <dl class="empty">
     
    637647         </dd>
    638648      </dl>
    639       <p id="rfc.section.2.2.p.6">compress<span id="rfc.iref.c.1"></span> 
     649      <p id="rfc.section.3.2.p.6">compress<span id="rfc.iref.c.1"></span> 
    640650      </p>
    641651      <dl class="empty">
     
    648658         </dd>
    649659      </dl>
    650       <p id="rfc.section.2.2.p.7">deflate<span id="rfc.iref.d.1"></span> 
     660      <p id="rfc.section.3.2.p.7">deflate<span id="rfc.iref.d.1"></span> 
    651661      </p>
    652662      <dl class="empty">
     
    654664         </dd>
    655665      </dl>
    656       <p id="rfc.section.2.2.p.8">identity<span id="rfc.iref.i.1"></span> 
     666      <p id="rfc.section.3.2.p.8">identity<span id="rfc.iref.i.1"></span> 
    657667      </p>
    658668      <dl class="empty">
     
    661671         </dd>
    662672      </dl>
    663       <p id="rfc.section.2.2.p.9">New content-coding value tokens <em class="bcp14">SHOULD</em> be registered; to allow interoperability between clients and servers, specifications of the content coding algorithms needed
     673      <p id="rfc.section.3.2.p.9">New content-coding value tokens <em class="bcp14">SHOULD</em> be registered; to allow interoperability between clients and servers, specifications of the content coding algorithms needed
    664674         to implement a new value <em class="bcp14">SHOULD</em> be publicly available and adequate for independent implementation, and conform to the purpose of content coding defined in
    665675         this section.
    666676      </p>
    667       <h2 id="rfc.section.2.3"><a href="#rfc.section.2.3">2.3</a>&nbsp;<a id="media.types" href="#media.types">Media Types</a></h2>
    668       <p id="rfc.section.2.3.p.1">HTTP uses Internet Media Types <a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> in the Content-Type (<a href="#header.content-type" id="rfc.xref.header.content-type.1" title="Content-Type">Section&nbsp;5.9</a>) and Accept (<a href="#header.accept" id="rfc.xref.header.accept.1" title="Accept">Section&nbsp;5.1</a>) header fields in order to provide open and extensible data typing and type negotiation.
    669       </p>
    670       <div id="rfc.figure.u.3"></div><pre class="inline"><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span><span id="rfc.iref.g.6"></span>  media-type     = type "/" subtype *( ";" parameter )
     677      <h2 id="rfc.section.3.3"><a href="#rfc.section.3.3">3.3</a>&nbsp;<a id="media.types" href="#media.types">Media Types</a></h2>
     678      <p id="rfc.section.3.3.p.1">HTTP uses Internet Media Types <a href="#RFC2046" id="rfc.xref.RFC2046.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> in the Content-Type (<a href="#header.content-type" id="rfc.xref.header.content-type.1" title="Content-Type">Section&nbsp;6.9</a>) and Accept (<a href="#header.accept" id="rfc.xref.header.accept.1" title="Accept">Section&nbsp;6.1</a>) header fields in order to provide open and extensible data typing and type negotiation.
     679      </p>
     680      <div id="rfc.figure.u.5"></div><pre class="inline"><span id="rfc.iref.g.4"></span><span id="rfc.iref.g.5"></span><span id="rfc.iref.g.6"></span>  media-type     = type "/" subtype *( ";" parameter )
    671681  type           = token
    672682  subtype        = token
    673 </pre><p id="rfc.section.2.3.p.3">Parameters <em class="bcp14">MAY</em> follow the type/subtype in the form of attribute/value pairs.
    674       </p>
    675       <div id="rfc.figure.u.4"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span>  parameter               = attribute "=" value
     683</pre><p id="rfc.section.3.3.p.3">Parameters <em class="bcp14">MAY</em> follow the type/subtype in the form of attribute/value pairs.
     684      </p>
     685      <div id="rfc.figure.u.6"></div><pre class="inline"><span id="rfc.iref.g.7"></span><span id="rfc.iref.g.8"></span><span id="rfc.iref.g.9"></span>  parameter               = attribute "=" value
    676686  attribute               = token
    677687  value                   = token | quoted-string
    678 </pre><p id="rfc.section.2.3.p.5">The type, subtype, and parameter attribute names are case-insensitive. Parameter values might or might not be case-sensitive,
     688</pre><p id="rfc.section.3.3.p.5">The type, subtype, and parameter attribute names are case-insensitive. Parameter values might or might not be case-sensitive,
    679689         depending on the semantics of the parameter name. Linear white space (LWS) <em class="bcp14">MUST NOT</em> be used between the type and subtype, nor between an attribute and its value. The presence or absence of a parameter might
    680690         be significant to the processing of a media-type, depending on its definition within the media type registry.
    681691      </p>
    682       <p id="rfc.section.2.3.p.6">Note that some older HTTP applications do not recognize media type parameters. When sending data to older HTTP applications,
     692      <p id="rfc.section.3.3.p.6">Note that some older HTTP applications do not recognize media type parameters. When sending data to older HTTP applications,
    683693         implementations <em class="bcp14">SHOULD</em> only use media type parameters when they are required by that type/subtype definition.
    684694      </p>
    685       <p id="rfc.section.2.3.p.7">Media-type values are registered with the Internet Assigned Number Authority (IANA). The media type registration process is
     695      <p id="rfc.section.3.3.p.7">Media-type values are registered with the Internet Assigned Number Authority (IANA). The media type registration process is
    686696         outlined in <a href="#RFC4288" id="rfc.xref.RFC4288.1"><cite title="Media Type Specifications and Registration Procedures">[RFC4288]</cite></a>. Use of non-registered media types is discouraged.
    687697      </p>
    688       <h3 id="rfc.section.2.3.1"><a href="#rfc.section.2.3.1">2.3.1</a>&nbsp;<a id="canonicalization.and.text.defaults" href="#canonicalization.and.text.defaults">Canonicalization and Text Defaults</a></h3>
    689       <p id="rfc.section.2.3.1.p.1">Internet media types are registered with a canonical form. An entity-body transferred via HTTP messages <em class="bcp14">MUST</em> be represented in the appropriate canonical form prior to its transmission except for "text" types, as defined in the next
     698      <h3 id="rfc.section.3.3.1"><a href="#rfc.section.3.3.1">3.3.1</a>&nbsp;<a id="canonicalization.and.text.defaults" href="#canonicalization.and.text.defaults">Canonicalization and Text Defaults</a></h3>
     699      <p id="rfc.section.3.3.1.p.1">Internet media types are registered with a canonical form. An entity-body transferred via HTTP messages <em class="bcp14">MUST</em> be represented in the appropriate canonical form prior to its transmission except for "text" types, as defined in the next
    690700         paragraph.
    691701      </p>
    692       <p id="rfc.section.2.3.1.p.2">When in canonical form, media subtypes of the "text" type use CRLF as the text line break. HTTP relaxes this requirement and
     702      <p id="rfc.section.3.3.1.p.2">When in canonical form, media subtypes of the "text" type use CRLF as the text line break. HTTP relaxes this requirement and
    693703         allows the transport of text media with plain CR or LF alone representing a line break when it is done consistently for an
    694704         entire entity-body. HTTP applications <em class="bcp14">MUST</em> accept CRLF, bare CR, and bare LF as being representative of a line break in text media received via HTTP. In addition, if
     
    698708         a bare CR or LF <em class="bcp14">MUST NOT</em> be substituted for CRLF within any of the HTTP control structures (such as header fields and multipart boundaries).
    699709      </p>
    700       <p id="rfc.section.2.3.1.p.3">If an entity-body is encoded with a content-coding, the underlying data <em class="bcp14">MUST</em> be in a form defined above prior to being encoded.
    701       </p>
    702       <p id="rfc.section.2.3.1.p.4">The "charset" parameter is used with some media types to define the character set (<a href="#character.sets" title="Character Sets">Section&nbsp;2.1</a>) of the data. When no explicit charset parameter is provided by the sender, media subtypes of the "text" type are defined
     710      <p id="rfc.section.3.3.1.p.3">If an entity-body is encoded with a content-coding, the underlying data <em class="bcp14">MUST</em> be in a form defined above prior to being encoded.
     711      </p>
     712      <p id="rfc.section.3.3.1.p.4">The "charset" parameter is used with some media types to define the character set (<a href="#character.sets" title="Character Sets">Section&nbsp;3.1</a>) of the data. When no explicit charset parameter is provided by the sender, media subtypes of the "text" type are defined
    703713         to have a default charset value of "ISO-8859-1" when received via HTTP. Data in character sets other than "ISO-8859-1" or
    704          its subsets <em class="bcp14">MUST</em> be labeled with an appropriate charset value. See <a href="#missing.charset" title="Missing Charset">Section&nbsp;2.1.1</a> for compatibility problems.
    705       </p>
    706       <h3 id="rfc.section.2.3.2"><a href="#rfc.section.2.3.2">2.3.2</a>&nbsp;<a id="multipart.types" href="#multipart.types">Multipart Types</a></h3>
    707       <p id="rfc.section.2.3.2.p.1">MIME provides for a number of "multipart" types -- encapsulations of one or more entities within a single message-body. All
     714         its subsets <em class="bcp14">MUST</em> be labeled with an appropriate charset value. See <a href="#missing.charset" title="Missing Charset">Section&nbsp;3.1.1</a> for compatibility problems.
     715      </p>
     716      <h3 id="rfc.section.3.3.2"><a href="#rfc.section.3.3.2">3.3.2</a>&nbsp;<a id="multipart.types" href="#multipart.types">Multipart Types</a></h3>
     717      <p id="rfc.section.3.3.2.p.1">MIME provides for a number of "multipart" types -- encapsulations of one or more entities within a single message-body. All
    708718         multipart types share a common syntax, as defined in <a href="http://tools.ietf.org/html/rfc2046#section-5.1.1">Section 5.1.1</a> of <a href="#RFC2046" id="rfc.xref.RFC2046.2"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a>, and <em class="bcp14">MUST</em> include a boundary parameter as part of the media type value. The message body is itself a protocol element and <em class="bcp14">MUST</em> therefore use only CRLF to represent line breaks between body-parts. Unlike in RFC 2046, the epilogue of any multipart message <em class="bcp14">MUST</em> be empty; HTTP applications <em class="bcp14">MUST NOT</em> transmit the epilogue (even if the original multipart contains an epilogue). These restrictions exist in order to preserve
    709719         the self-delimiting nature of a multipart message-body, wherein the "end" of the message-body is indicated by the ending multipart
    710720         boundary.
    711721      </p>
    712       <p id="rfc.section.2.3.2.p.2">In general, HTTP treats a multipart message-body no differently than any other media type: strictly as payload. The one exception
     722      <p id="rfc.section.3.3.2.p.2">In general, HTTP treats a multipart message-body no differently than any other media type: strictly as payload. The one exception
    713723         is the "multipart/byteranges" type (<a href="p5-range.html#internet.media.type.multipart.byteranges" title="Internet Media Type multipart/byteranges">Appendix A</a> of <a href="#Part5" id="rfc.xref.Part5.1"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>) when it appears in a 206 (Partial Content) response.
    714724      </p>
    715       <p id="rfc.section.2.3.2.p.3">In general, an HTTP user agent <em class="bcp14">SHOULD</em> follow the same or similar behavior as a MIME user agent would upon receipt of a multipart type. If an application receives
     725      <p id="rfc.section.3.3.2.p.3">In general, an HTTP user agent <em class="bcp14">SHOULD</em> follow the same or similar behavior as a MIME user agent would upon receipt of a multipart type. If an application receives
    716726         an unrecognized multipart subtype, the application <em class="bcp14">MUST</em> treat it as being equivalent to "multipart/mixed".
    717727      </p>
     
    721731         </dd>
    722732      </dl>
    723       <h2 id="rfc.section.2.4"><a href="#rfc.section.2.4">2.4</a>&nbsp;<a id="quality.values" href="#quality.values">Quality Values</a></h2>
    724       <p id="rfc.section.2.4.p.1">HTTP content negotiation (<a href="#content.negotiation" title="Content Negotiation">Section&nbsp;4</a>) uses short "floating point" numbers to indicate the relative importance ("weight") of various negotiable parameters. A weight
     733      <h2 id="rfc.section.3.4"><a href="#rfc.section.3.4">3.4</a>&nbsp;<a id="quality.values" href="#quality.values">Quality Values</a></h2>
     734      <p id="rfc.section.3.4.p.1">HTTP content negotiation (<a href="#content.negotiation" title="Content Negotiation">Section&nbsp;5</a>) uses short "floating point" numbers to indicate the relative importance ("weight") of various negotiable parameters. A weight
    725735         is normalized to a real number in the range 0 through 1, where 0 is the minimum and 1 the maximum value. If a parameter has
    726736         a quality value of 0, then content with this parameter is `not acceptable' for the client. HTTP/1.1 applications <em class="bcp14">MUST NOT</em> generate more than three digits after the decimal point. User configuration of these values <em class="bcp14">SHOULD</em> also be limited in this fashion.
    727737      </p>
    728       <div id="rfc.figure.u.5"></div><pre class="inline"><span id="rfc.iref.g.10"></span>  qvalue         = ( "0" [ "." 0*3DIGIT ] )
     738      <div id="rfc.figure.u.7"></div><pre class="inline"><span id="rfc.iref.g.10"></span>  qvalue         = ( "0" [ "." 0*3DIGIT ] )
    729739                 | ( "1" [ "." 0*3("0") ] )
    730 </pre><p id="rfc.section.2.4.p.3">"Quality values" is a misnomer, since these values merely represent relative degradation in desired quality.</p>
    731       <h2 id="rfc.section.2.5"><a href="#rfc.section.2.5">2.5</a>&nbsp;<a id="language.tags" href="#language.tags">Language Tags</a></h2>
    732       <p id="rfc.section.2.5.p.1">A language tag identifies a natural language spoken, written, or otherwise conveyed by human beings for communication of information
     740</pre><p id="rfc.section.3.4.p.3">"Quality values" is a misnomer, since these values merely represent relative degradation in desired quality.</p>
     741      <h2 id="rfc.section.3.5"><a href="#rfc.section.3.5">3.5</a>&nbsp;<a id="language.tags" href="#language.tags">Language Tags</a></h2>
     742      <p id="rfc.section.3.5.p.1">A language tag identifies a natural language spoken, written, or otherwise conveyed by human beings for communication of information
    733743         to other human beings. Computer languages are explicitly excluded. HTTP uses language tags within the Accept-Language and
    734744         Content-Language fields.
    735745      </p>
    736       <p id="rfc.section.2.5.p.2">The syntax and registry of HTTP language tags is the same as that defined by <a href="#RFC1766" id="rfc.xref.RFC1766.1"><cite title="Tags for the Identification of Languages">[RFC1766]</cite></a>. In summary, a language tag is composed of 1 or more parts: A primary language tag and a possibly empty series of subtags:
    737       </p>
    738       <div id="rfc.figure.u.6"></div><pre class="inline"><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span>  language-tag  = primary-tag *( "-" subtag )
     746      <p id="rfc.section.3.5.p.2">The syntax and registry of HTTP language tags is the same as that defined by <a href="#RFC1766" id="rfc.xref.RFC1766.1"><cite title="Tags for the Identification of Languages">[RFC1766]</cite></a>. In summary, a language tag is composed of 1 or more parts: A primary language tag and a possibly empty series of subtags:
     747      </p>
     748      <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.11"></span><span id="rfc.iref.g.12"></span><span id="rfc.iref.g.13"></span>  language-tag  = primary-tag *( "-" subtag )
    739749  primary-tag   = 1*8ALPHA
    740750  subtag        = 1*8ALPHA
    741 </pre><p id="rfc.section.2.5.p.4">White space is not allowed within the tag and all tags are case-insensitive. The name space of language tags is administered
     751</pre><p id="rfc.section.3.5.p.4">White space is not allowed within the tag and all tags are case-insensitive. The name space of language tags is administered
    742752         by the IANA. Example tags include:
    743753      </p>
    744       <div id="rfc.figure.u.7"></div><pre class="text">    en, en-US, en-cockney, i-cherokee, x-pig-latin
    745 </pre><p id="rfc.section.2.5.p.6">where any two-letter primary-tag is an ISO-639 language abbreviation and any two-letter initial subtag is an ISO-3166 country
     754      <div id="rfc.figure.u.9"></div><pre class="text">    en, en-US, en-cockney, i-cherokee, x-pig-latin
     755</pre><p id="rfc.section.3.5.p.6">where any two-letter primary-tag is an ISO-639 language abbreviation and any two-letter initial subtag is an ISO-3166 country
    746756         code. (The last three tags above are not registered tags; all but the last are examples of tags which could be registered
    747757         in future.)
    748758      </p>
    749       <h1 id="rfc.section.3"><a href="#rfc.section.3">3.</a>&nbsp;<a id="entity" href="#entity">Entity</a></h1>
    750       <p id="rfc.section.3.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer an entity if not otherwise restricted by the request method or response status code. An entity consists of entity-header
     759      <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="entity" href="#entity">Entity</a></h1>
     760      <p id="rfc.section.4.p.1">Request and Response messages <em class="bcp14">MAY</em> transfer an entity if not otherwise restricted by the request method or response status code. An entity consists of entity-header
    751761         fields and an entity-body, although some responses will only include the entity-headers.
    752762      </p>
    753       <p id="rfc.section.3.p.2">In this section, both sender and recipient refer to either the client or the server, depending on who sends and who receives
     763      <p id="rfc.section.4.p.2">In this section, both sender and recipient refer to either the client or the server, depending on who sends and who receives
    754764         the entity.
    755765      </p>
    756       <h2 id="rfc.section.3.1"><a href="#rfc.section.3.1">3.1</a>&nbsp;<a id="entity.header.fields" href="#entity.header.fields">Entity Header Fields</a></h2>
    757       <p id="rfc.section.3.1.p.1">Entity-header fields define metainformation about the entity-body or, if no body is present, about the resource identified
     766      <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="entity.header.fields" href="#entity.header.fields">Entity Header Fields</a></h2>
     767      <p id="rfc.section.4.1.p.1">Entity-header fields define metainformation about the entity-body or, if no body is present, about the resource identified
    758768         by the request.
    759769      </p>
    760       <div id="rfc.figure.u.8"></div><pre class="inline"><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  entity-header  = Allow                    ; <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 9.1</a>
    761                  | Content-Encoding         ; <a href="#header.content-encoding" id="rfc.xref.header.content-encoding.2" title="Content-Encoding">Section&nbsp;5.5</a>
    762                  | Content-Language         ; <a href="#header.content-language" id="rfc.xref.header.content-language.1" title="Content-Language">Section&nbsp;5.6</a>
    763                  | Content-Length           ; <a href="#Part1" id="rfc.xref.Part1.1"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>
    764                  | Content-Location         ; <a href="#header.content-location" id="rfc.xref.header.content-location.1" title="Content-Location">Section&nbsp;5.7</a>
    765                  | Content-MD5              ; <a href="#header.content-md5" id="rfc.xref.header.content-md5.1" title="Content-MD5">Section&nbsp;5.8</a>
    766                  | Content-Range            ; <a href="#Part5" id="rfc.xref.Part5.2"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 5.2</a>
    767                  | Content-Type             ; <a href="#header.content-type" id="rfc.xref.header.content-type.2" title="Content-Type">Section&nbsp;5.9</a>
    768                  | Expires                  ; <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 15.3</a>
    769                  | Last-Modified            ; <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 6.6</a>
     770      <div id="rfc.figure.u.10"></div><pre class="inline"><span id="rfc.iref.g.14"></span><span id="rfc.iref.g.15"></span>  entity-header  = Allow                    ; <a href="#Part2" id="rfc.xref.Part2.1"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>, <a href="p2-semantics.html#header.allow" title="Allow">Section 10.1</a>
     771                 | Content-Encoding         ; <a href="#header.content-encoding" id="rfc.xref.header.content-encoding.2" title="Content-Encoding">Section&nbsp;6.5</a>
     772                 | Content-Language         ; <a href="#header.content-language" id="rfc.xref.header.content-language.1" title="Content-Language">Section&nbsp;6.6</a>
     773                 | Content-Length           ; <a href="#Part1" id="rfc.xref.Part1.8"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="p1-messaging.html#header.content-length" title="Content-Length">Section 8.2</a>
     774                 | Content-Location         ; <a href="#header.content-location" id="rfc.xref.header.content-location.1" title="Content-Location">Section&nbsp;6.7</a>
     775                 | Content-MD5              ; <a href="#header.content-md5" id="rfc.xref.header.content-md5.1" title="Content-MD5">Section&nbsp;6.8</a>
     776                 | Content-Range            ; <a href="#Part5" id="rfc.xref.Part5.2"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a>, <a href="p5-range.html#header.content-range" title="Content-Range">Section 6.2</a>
     777                 | Content-Type             ; <a href="#header.content-type" id="rfc.xref.header.content-type.2" title="Content-Type">Section&nbsp;6.9</a>
     778                 | Expires                  ; <a href="#Part6" id="rfc.xref.Part6.1"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>, <a href="p6-cache.html#header.expires" title="Expires">Section 16.3</a>
     779                 | Last-Modified            ; <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>, <a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 7.6</a>
    770780                 | extension-header
    771781 
    772782  extension-header = message-header
    773 </pre><p id="rfc.section.3.1.p.3">The extension-header mechanism allows additional entity-header fields to be defined without changing the protocol, but these
     783</pre><p id="rfc.section.4.1.p.3">The extension-header mechanism allows additional entity-header fields to be defined without changing the protocol, but these
    774784         fields cannot be assumed to be recognizable by the recipient. Unrecognized header fields <em class="bcp14">SHOULD</em> be ignored by the recipient and <em class="bcp14">MUST</em> be forwarded by transparent proxies.
    775785      </p>
    776       <h2 id="rfc.section.3.2"><a href="#rfc.section.3.2">3.2</a>&nbsp;<a id="entity.body" href="#entity.body">Entity Body</a></h2>
    777       <p id="rfc.section.3.2.p.1">The entity-body (if any) sent with an HTTP request or response is in a format and encoding defined by the entity-header fields.</p>
    778       <div id="rfc.figure.u.9"></div><pre class="inline"><span id="rfc.iref.g.16"></span>  entity-body    = *OCTET
    779 </pre><p id="rfc.section.3.2.p.3">An entity-body is only present in a message when a message-body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.2"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure
     786      <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="entity.body" href="#entity.body">Entity Body</a></h2>
     787      <p id="rfc.section.4.2.p.1">The entity-body (if any) sent with an HTTP request or response is in a format and encoding defined by the entity-header fields.</p>
     788      <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.16"></span>  entity-body    = *OCTET
     789</pre><p id="rfc.section.4.2.p.3">An entity-body is only present in a message when a message-body is present, as described in <a href="p1-messaging.html#message.body" title="Message Body">Section 4.3</a> of <a href="#Part1" id="rfc.xref.Part1.9"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>. The entity-body is obtained from the message-body by decoding any Transfer-Encoding that might have been applied to ensure
    780790         safe and proper transfer of the message.
    781791      </p>
    782       <h3 id="rfc.section.3.2.1"><a href="#rfc.section.3.2.1">3.2.1</a>&nbsp;<a id="type" href="#type">Type</a></h3>
    783       <p id="rfc.section.3.2.1.p.1">When an entity-body is included with a message, the data type of that body is determined via the header fields Content-Type
     792      <h3 id="rfc.section.4.2.1"><a href="#rfc.section.4.2.1">4.2.1</a>&nbsp;<a id="type" href="#type">Type</a></h3>
     793      <p id="rfc.section.4.2.1.p.1">When an entity-body is included with a message, the data type of that body is determined via the header fields Content-Type
    784794         and Content-Encoding. These define a two-layer, ordered encoding model:
    785795      </p>
    786       <div id="rfc.figure.u.10"></div><pre class="text">    entity-body := Content-Encoding( Content-Type( data ) )
    787 </pre><p id="rfc.section.3.2.1.p.3">Content-Type specifies the media type of the underlying data. Content-Encoding may be used to indicate any additional content
     796      <div id="rfc.figure.u.12"></div><pre class="text">    entity-body := Content-Encoding( Content-Type( data ) )
     797</pre><p id="rfc.section.4.2.1.p.3">Content-Type specifies the media type of the underlying data. Content-Encoding may be used to indicate any additional content
    788798         codings applied to the data, usually for the purpose of data compression, that are a property of the requested resource. There
    789799         is no default encoding.
    790800      </p>
    791       <p id="rfc.section.3.2.1.p.4">Any HTTP/1.1 message containing an entity-body <em class="bcp14">SHOULD</em> include a Content-Type header field defining the media type of that body. If and only if the media type is not given by a
     801      <p id="rfc.section.4.2.1.p.4">Any HTTP/1.1 message containing an entity-body <em class="bcp14">SHOULD</em> include a Content-Type header field defining the media type of that body. If and only if the media type is not given by a
    792802         Content-Type field, the recipient <em class="bcp14">MAY</em> attempt to guess the media type via inspection of its content and/or the name extension(s) of the URI used to identify the
    793803         resource. If the media type remains unknown, the recipient <em class="bcp14">SHOULD</em> treat it as type "application/octet-stream".
    794804      </p>
    795       <h3 id="rfc.section.3.2.2"><a href="#rfc.section.3.2.2">3.2.2</a>&nbsp;<a id="entity.length" href="#entity.length">Entity Length</a></h3>
    796       <p id="rfc.section.3.2.2.p.1">The entity-length of a message is the length of the message-body before any transfer-codings have been applied. <a href="p1-messaging.html#message.length" title="Message Length">Section 4.4</a> of <a href="#Part1" id="rfc.xref.Part1.3"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> defines how the transfer-length of a message-body is determined.
    797       </p>
    798       <h1 id="rfc.section.4"><a href="#rfc.section.4">4.</a>&nbsp;<a id="content.negotiation" href="#content.negotiation">Content Negotiation</a></h1>
    799       <p id="rfc.section.4.p.1">Most HTTP responses include an entity which contains information for interpretation by a human user. Naturally, it is desirable
     805      <h3 id="rfc.section.4.2.2"><a href="#rfc.section.4.2.2">4.2.2</a>&nbsp;<a id="entity.length" href="#entity.length">Entity Length</a></h3>
     806      <p id="rfc.section.4.2.2.p.1">The entity-length of a message is the length of the message-body before any transfer-codings have been applied. <a href="p1-messaging.html#message.length" title="Message Length">Section 4.4</a> of <a href="#Part1" id="rfc.xref.Part1.10"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a> defines how the transfer-length of a message-body is determined.
     807      </p>
     808      <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="content.negotiation" href="#content.negotiation">Content Negotiation</a></h1>
     809      <p id="rfc.section.5.p.1">Most HTTP responses include an entity which contains information for interpretation by a human user. Naturally, it is desirable
    800810         to supply the user with the "best available" entity corresponding to the request. Unfortunately for servers and caches, not
    801811         all users have the same preferences for what is "best," and not all user agents are equally capable of rendering all entity
     
    808818         </dd>
    809819      </dl>
    810       <p id="rfc.section.4.p.2">Any response containing an entity-body <em class="bcp14">MAY</em> be subject to negotiation, including error responses.
    811       </p>
    812       <p id="rfc.section.4.p.3">There are two kinds of content negotiation which are possible in HTTP: server-driven and agent-driven negotiation. These two
     820      <p id="rfc.section.5.p.2">Any response containing an entity-body <em class="bcp14">MAY</em> be subject to negotiation, including error responses.
     821      </p>
     822      <p id="rfc.section.5.p.3">There are two kinds of content negotiation which are possible in HTTP: server-driven and agent-driven negotiation. These two
    813823         kinds of negotiation are orthogonal and thus may be used separately or in combination. One method of combination, referred
    814824         to as transparent negotiation, occurs when a cache uses the agent-driven negotiation information provided by the origin server
    815825         in order to provide server-driven negotiation for subsequent requests.
    816826      </p>
    817       <h2 id="rfc.section.4.1"><a href="#rfc.section.4.1">4.1</a>&nbsp;<a id="server-driven.negotiation" href="#server-driven.negotiation">Server-driven Negotiation</a></h2>
    818       <p id="rfc.section.4.1.p.1">If the selection of the best representation for a response is made by an algorithm located at the server, it is called server-driven
     827      <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="server-driven.negotiation" href="#server-driven.negotiation">Server-driven Negotiation</a></h2>
     828      <p id="rfc.section.5.1.p.1">If the selection of the best representation for a response is made by an algorithm located at the server, it is called server-driven
    819829         negotiation. Selection is based on the available representations of the response (the dimensions over which it can vary; e.g.
    820830         language, content-coding, etc.) and the contents of particular header fields in the request message or on other information
    821831         pertaining to the request (such as the network address of the client).
    822832      </p>
    823       <p id="rfc.section.4.1.p.2">Server-driven negotiation is advantageous when the algorithm for selecting from among the available representations is difficult
     833      <p id="rfc.section.5.1.p.2">Server-driven negotiation is advantageous when the algorithm for selecting from among the available representations is difficult
    824834         to describe to the user agent, or when the server desires to send its "best guess" to the client along with the first response
    825835         (hoping to avoid the round-trip delay of a subsequent request if the "best guess" is good enough for the user). In order to
    826836         improve the server's guess, the user agent <em class="bcp14">MAY</em> include request header fields (Accept, Accept-Language, Accept-Encoding, etc.) which describe its preferences for such a response.
    827837      </p>
    828       <p id="rfc.section.4.1.p.3">Server-driven negotiation has disadvantages: </p>
     838      <p id="rfc.section.5.1.p.3">Server-driven negotiation has disadvantages: </p>
    829839      <ol>
    830840         <li>It is impossible for the server to accurately determine what might be "best" for any given user, since that would require
     
    838848         <li>It may limit a public cache's ability to use the same response for multiple user's requests.</li>
    839849      </ol>
    840       <p id="rfc.section.4.1.p.4">HTTP/1.1 includes the following request-header fields for enabling server-driven negotiation through description of user agent
    841          capabilities and user preferences: Accept (<a href="#header.accept" id="rfc.xref.header.accept.2" title="Accept">Section&nbsp;5.1</a>), Accept-Charset (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.1" title="Accept-Charset">Section&nbsp;5.2</a>), Accept-Encoding (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.2" title="Accept-Encoding">Section&nbsp;5.3</a>), Accept-Language (<a href="#header.accept-language" id="rfc.xref.header.accept-language.1" title="Accept-Language">Section&nbsp;5.4</a>), and User-Agent (<a href="p2-semantics.html#header.user-agent" title="User-Agent">Section 9.9</a> of <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). However, an origin server is not limited to these dimensions and <em class="bcp14">MAY</em> vary the response based on any aspect of the request, including information outside the request-header fields or within extension
     850      <p id="rfc.section.5.1.p.4">HTTP/1.1 includes the following request-header fields for enabling server-driven negotiation through description of user agent
     851         capabilities and user preferences: Accept (<a href="#header.accept" id="rfc.xref.header.accept.2" title="Accept">Section&nbsp;6.1</a>), Accept-Charset (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.1" title="Accept-Charset">Section&nbsp;6.2</a>), Accept-Encoding (<a href="#header.accept-encoding" id="rfc.xref.header.accept-encoding.2" title="Accept-Encoding">Section&nbsp;6.3</a>), Accept-Language (<a href="#header.accept-language" id="rfc.xref.header.accept-language.1" title="Accept-Language">Section&nbsp;6.4</a>), and User-Agent (<a href="p2-semantics.html#header.user-agent" title="User-Agent">Section 10.9</a> of <a href="#Part2" id="rfc.xref.Part2.2"><cite title="HTTP/1.1, part 2: Message Semantics">[Part2]</cite></a>). However, an origin server is not limited to these dimensions and <em class="bcp14">MAY</em> vary the response based on any aspect of the request, including information outside the request-header fields or within extension
    842852         header fields not defined by this specification.
    843853      </p>
    844       <p id="rfc.section.4.1.p.5">The Vary header field (<a href="p6-cache.html#header.vary" title="Vary">Section 15.5</a> of <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) can be used to express the parameters the server uses to select a representation that is subject to server-driven negotiation.
    845       </p>
    846       <h2 id="rfc.section.4.2"><a href="#rfc.section.4.2">4.2</a>&nbsp;<a id="agent-driven.negotiation" href="#agent-driven.negotiation">Agent-driven Negotiation</a></h2>
    847       <p id="rfc.section.4.2.p.1">With agent-driven negotiation, selection of the best representation for a response is performed by the user agent after receiving
     854      <p id="rfc.section.5.1.p.5">The Vary header field (<a href="p6-cache.html#header.vary" title="Vary">Section 16.5</a> of <a href="#Part6" id="rfc.xref.Part6.2"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>) can be used to express the parameters the server uses to select a representation that is subject to server-driven negotiation.
     855      </p>
     856      <h2 id="rfc.section.5.2"><a href="#rfc.section.5.2">5.2</a>&nbsp;<a id="agent-driven.negotiation" href="#agent-driven.negotiation">Agent-driven Negotiation</a></h2>
     857      <p id="rfc.section.5.2.p.1">With agent-driven negotiation, selection of the best representation for a response is performed by the user agent after receiving
    848858         an initial response from the origin server. Selection is based on a list of the available representations of the response
    849859         included within the header fields or entity-body of the initial response, with each representation identified by its own URI.
     
    851861         by the user selecting from a generated (possibly hypertext) menu.
    852862      </p>
    853       <p id="rfc.section.4.2.p.2">Agent-driven negotiation is advantageous when the response would vary over commonly-used dimensions (such as type, language,
     863      <p id="rfc.section.5.2.p.2">Agent-driven negotiation is advantageous when the response would vary over commonly-used dimensions (such as type, language,
    854864         or encoding), when the origin server is unable to determine a user agent's capabilities from examining the request, and generally
    855865         when public caches are used to distribute server load and reduce network usage.
    856866      </p>
    857       <p id="rfc.section.4.2.p.3">Agent-driven negotiation suffers from the disadvantage of needing a second request to obtain the best alternate representation.
     867      <p id="rfc.section.5.2.p.3">Agent-driven negotiation suffers from the disadvantage of needing a second request to obtain the best alternate representation.
    858868         This second request is only efficient when caching is used. In addition, this specification does not define any mechanism
    859869         for supporting automatic selection, though it also does not prevent any such mechanism from being developed as an extension
    860870         and used within HTTP/1.1.
    861871      </p>
    862       <p id="rfc.section.4.2.p.4">HTTP/1.1 defines the 300 (Multiple Choices) and 406 (Not Acceptable) status codes for enabling agent-driven negotiation when
     872      <p id="rfc.section.5.2.p.4">HTTP/1.1 defines the 300 (Multiple Choices) and 406 (Not Acceptable) status codes for enabling agent-driven negotiation when
    863873         the server is unwilling or unable to provide a varying response using server-driven negotiation.
    864874      </p>
    865       <h2 id="rfc.section.4.3"><a href="#rfc.section.4.3">4.3</a>&nbsp;<a id="transparent.negotiation" href="#transparent.negotiation">Transparent Negotiation</a></h2>
    866       <p id="rfc.section.4.3.p.1">Transparent negotiation is a combination of both server-driven and agent-driven negotiation. When a cache is supplied with
     875      <h2 id="rfc.section.5.3"><a href="#rfc.section.5.3">5.3</a>&nbsp;<a id="transparent.negotiation" href="#transparent.negotiation">Transparent Negotiation</a></h2>
     876      <p id="rfc.section.5.3.p.1">Transparent negotiation is a combination of both server-driven and agent-driven negotiation. When a cache is supplied with
    867877         a form of the list of available representations of the response (as in agent-driven negotiation) and the dimensions of variance
    868878         are completely understood by the cache, then the cache becomes capable of performing server-driven negotiation on behalf of
    869879         the origin server for subsequent requests on that resource.
    870880      </p>
    871       <p id="rfc.section.4.3.p.2">Transparent negotiation has the advantage of distributing the negotiation work that would otherwise be required of the origin
     881      <p id="rfc.section.5.3.p.2">Transparent negotiation has the advantage of distributing the negotiation work that would otherwise be required of the origin
    872882         server and also removing the second request delay of agent-driven negotiation when the cache is able to correctly guess the
    873883         right response.
    874884      </p>
    875       <p id="rfc.section.4.3.p.3">This specification does not define any mechanism for transparent negotiation, though it also does not prevent any such mechanism
     885      <p id="rfc.section.5.3.p.3">This specification does not define any mechanism for transparent negotiation, though it also does not prevent any such mechanism
    876886         from being developed as an extension that could be used within HTTP/1.1.
    877887      </p>
    878       <h1 id="rfc.section.5"><a href="#rfc.section.5">5.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Field Definitions</a></h1>
    879       <p id="rfc.section.5.p.1">This section defines the syntax and semantics of HTTP/1.1 header fields related to the payload of messages.</p>
    880       <p id="rfc.section.5.p.2">For entity-header fields, both sender and recipient refer to either the client or the server, depending on who sends and who
     888      <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="header.fields" href="#header.fields">Header Field Definitions</a></h1>
     889      <p id="rfc.section.6.p.1">This section defines the syntax and semantics of HTTP/1.1 header fields related to the payload of messages.</p>
     890      <p id="rfc.section.6.p.2">For entity-header fields, both sender and recipient refer to either the client or the server, depending on who sends and who
    881891         receives the entity.
    882892      </p>
    883893      <div id="rfc.iref.a.1"></div>
    884894      <div id="rfc.iref.h.1"></div>
    885       <h2 id="rfc.section.5.1"><a href="#rfc.section.5.1">5.1</a>&nbsp;<a id="header.accept" href="#header.accept">Accept</a></h2>
    886       <p id="rfc.section.5.1.p.1">The Accept request-header field can be used to specify certain media types which are acceptable for the response. Accept headers
     895      <h2 id="rfc.section.6.1"><a href="#rfc.section.6.1">6.1</a>&nbsp;<a id="header.accept" href="#header.accept">Accept</a></h2>
     896      <p id="rfc.section.6.1.p.1">The Accept request-header field can be used to specify certain media types which are acceptable for the response. Accept headers
    887897         can be used to indicate that the request is specifically limited to a small set of desired types, as in the case of a request
    888898         for an in-line image.
    889899      </p>
    890       <div id="rfc.figure.u.11"></div><pre class="inline"><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  Accept         = "Accept" ":"
     900      <div id="rfc.figure.u.13"></div><pre class="inline"><span id="rfc.iref.g.17"></span><span id="rfc.iref.g.18"></span><span id="rfc.iref.g.19"></span><span id="rfc.iref.g.20"></span>  Accept         = "Accept" ":"
    891901                   #( media-range [ accept-params ] )
    892902 
     
    897907  accept-params  = ";" "q" "=" qvalue *( accept-extension )
    898908  accept-extension = ";" token [ "=" ( token | quoted-string ) ]
    899 </pre><p id="rfc.section.5.1.p.3">The asterisk "*" character is used to group media types into ranges, with "*/*" indicating all media types and "type/*" indicating
     909</pre><p id="rfc.section.6.1.p.3">The asterisk "*" character is used to group media types into ranges, with "*/*" indicating all media types and "type/*" indicating
    900910         all subtypes of that type. The media-range <em class="bcp14">MAY</em> include media type parameters that are applicable to that range.
    901911      </p>
    902       <p id="rfc.section.5.1.p.4">Each media-range <em class="bcp14">MAY</em> be followed by one or more accept-params, beginning with the "q" parameter for indicating a relative quality factor. The first
     912      <p id="rfc.section.6.1.p.4">Each media-range <em class="bcp14">MAY</em> be followed by one or more accept-params, beginning with the "q" parameter for indicating a relative quality factor. The first
    903913         "q" parameter (if any) separates the media-range parameter(s) from the accept-params. Quality factors allow the user or user
    904          agent to indicate the relative degree of preference for that media-range, using the qvalue scale from 0 to 1 (<a href="#quality.values" title="Quality Values">Section&nbsp;2.4</a>). The default value is q=1.
     914         agent to indicate the relative degree of preference for that media-range, using the qvalue scale from 0 to 1 (<a href="#quality.values" title="Quality Values">Section&nbsp;3.4</a>). The default value is q=1.
    905915      </p>
    906916      <dl class="empty">
     
    911921         </dd>
    912922      </dl>
    913       <p id="rfc.section.5.1.p.5">The example</p>
    914       <div id="rfc.figure.u.12"></div><pre class="text">    Accept: audio/*; q=0.2, audio/basic
    915 </pre><p id="rfc.section.5.1.p.7"> <em class="bcp14">SHOULD</em> be interpreted as "I prefer audio/basic, but send me any audio type if it is the best available after an 80% mark-down in
     923      <p id="rfc.section.6.1.p.5">The example</p>
     924      <div id="rfc.figure.u.14"></div><pre class="text">    Accept: audio/*; q=0.2, audio/basic
     925</pre><p id="rfc.section.6.1.p.7"> <em class="bcp14">SHOULD</em> be interpreted as "I prefer audio/basic, but send me any audio type if it is the best available after an 80% mark-down in
    916926         quality."
    917927      </p>
    918       <p id="rfc.section.5.1.p.8">If no Accept header field is present, then it is assumed that the client accepts all media types. If an Accept header field
     928      <p id="rfc.section.6.1.p.8">If no Accept header field is present, then it is assumed that the client accepts all media types. If an Accept header field
    919929         is present, and if the server cannot send a response which is acceptable according to the combined Accept field value, then
    920930         the server <em class="bcp14">SHOULD</em> send a 406 (Not Acceptable) response.
    921931      </p>
    922       <p id="rfc.section.5.1.p.9">A more elaborate example is</p>
    923       <div id="rfc.figure.u.13"></div><pre class="text">    Accept: text/plain; q=0.5, text/html,
     932      <p id="rfc.section.6.1.p.9">A more elaborate example is</p>
     933      <div id="rfc.figure.u.15"></div><pre class="text">    Accept: text/plain; q=0.5, text/html,
    924934            text/x-dvi; q=0.8, text/x-c
    925 </pre><p id="rfc.section.5.1.p.11">Verbally, this would be interpreted as "text/html and text/x-c are the preferred media types, but if they do not exist, then
     935</pre><p id="rfc.section.6.1.p.11">Verbally, this would be interpreted as "text/html and text/x-c are the preferred media types, but if they do not exist, then
    926936         send the text/x-dvi entity, and if that does not exist, send the text/plain entity."
    927937      </p>
    928       <p id="rfc.section.5.1.p.12">Media ranges can be overridden by more specific media ranges or specific media types. If more than one media range applies
     938      <p id="rfc.section.6.1.p.12">Media ranges can be overridden by more specific media ranges or specific media types. If more than one media range applies
    929939         to a given type, the most specific reference has precedence. For example,
    930940      </p>
    931       <div id="rfc.figure.u.14"></div><pre class="text">    Accept: text/*, text/html, text/html;level=1, */*
    932 </pre><p id="rfc.section.5.1.p.14">have the following precedence:</p>
    933       <div id="rfc.figure.u.15"></div><pre class="text">    1) text/html;level=1
     941      <div id="rfc.figure.u.16"></div><pre class="text">    Accept: text/*, text/html, text/html;level=1, */*
     942</pre><p id="rfc.section.6.1.p.14">have the following precedence:</p>
     943      <div id="rfc.figure.u.17"></div><pre class="text">    1) text/html;level=1
    934944    2) text/html
    935945    3) text/*
    936946    4) */*
    937 </pre><p id="rfc.section.5.1.p.16">The media type quality factor associated with a given type is determined by finding the media range with the highest precedence
     947</pre><p id="rfc.section.6.1.p.16">The media type quality factor associated with a given type is determined by finding the media range with the highest precedence
    938948         which matches that type. For example,
    939949      </p>
    940       <div id="rfc.figure.u.16"></div><pre class="text">    Accept: text/*;q=0.3, text/html;q=0.7, text/html;level=1,
     950      <div id="rfc.figure.u.18"></div><pre class="text">    Accept: text/*;q=0.3, text/html;q=0.7, text/html;level=1,
    941951            text/html;level=2;q=0.4, */*;q=0.5
    942 </pre><p id="rfc.section.5.1.p.18">would cause the following values to be associated:</p>
    943       <div id="rfc.figure.u.17"></div><pre class="text">    text/html;level=1         = 1
     952</pre><p id="rfc.section.6.1.p.18">would cause the following values to be associated:</p>
     953      <div id="rfc.figure.u.19"></div><pre class="text">    text/html;level=1         = 1
    944954    text/html                 = 0.7
    945955    text/plain                = 0.3
     
    947957    text/html;level=2         = 0.4
    948958    text/html;level=3         = 0.7
    949 </pre><p id="rfc.section.5.1.p.20"> <b>Note:</b> A user agent might be provided with a default set of quality values for certain media ranges. However, unless the user agent
     959</pre><p id="rfc.section.6.1.p.20"> <b>Note:</b> A user agent might be provided with a default set of quality values for certain media ranges. However, unless the user agent
    950960         is a closed system which cannot interact with other rendering agents, this default set ought to be configurable by the user.
    951961      </p>
    952962      <div id="rfc.iref.a.2"></div>
    953963      <div id="rfc.iref.h.2"></div>
    954       <h2 id="rfc.section.5.2"><a href="#rfc.section.5.2">5.2</a>&nbsp;<a id="header.accept-charset" href="#header.accept-charset">Accept-Charset</a></h2>
    955       <p id="rfc.section.5.2.p.1">The Accept-Charset request-header field can be used to indicate what character sets are acceptable for the response. This
     964      <h2 id="rfc.section.6.2"><a href="#rfc.section.6.2">6.2</a>&nbsp;<a id="header.accept-charset" href="#header.accept-charset">Accept-Charset</a></h2>
     965      <p id="rfc.section.6.2.p.1">The Accept-Charset request-header field can be used to indicate what character sets are acceptable for the response. This
    956966         field allows clients capable of understanding more comprehensive or special-purpose character sets to signal that capability
    957967         to a server which is capable of representing documents in those character sets.
    958968      </p>
    959       <div id="rfc.figure.u.18"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  Accept-Charset = "Accept-Charset" ":"
     969      <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.21"></span>  Accept-Charset = "Accept-Charset" ":"
    960970          1#( ( charset | "*" ) [ ";" "q" "=" qvalue ] )
    961 </pre><p id="rfc.section.5.2.p.3">Character set values are described in <a href="#character.sets" title="Character Sets">Section&nbsp;2.1</a>. Each charset <em class="bcp14">MAY</em> be given an associated quality value which represents the user's preference for that charset. The default value is q=1. An
     971</pre><p id="rfc.section.6.2.p.3">Character set values are described in <a href="#character.sets" title="Character Sets">Section&nbsp;3.1</a>. Each charset <em class="bcp14">MAY</em> be given an associated quality value which represents the user's preference for that charset. The default value is q=1. An
    962972         example is
    963973      </p>
    964       <div id="rfc.figure.u.19"></div><pre class="text">   Accept-Charset: iso-8859-5, unicode-1-1;q=0.8
    965 </pre><p id="rfc.section.5.2.p.5">The special value "*", if present in the Accept-Charset field, matches every character set (including ISO-8859-1) which is
     974      <div id="rfc.figure.u.21"></div><pre class="text">   Accept-Charset: iso-8859-5, unicode-1-1;q=0.8
     975</pre><p id="rfc.section.6.2.p.5">The special value "*", if present in the Accept-Charset field, matches every character set (including ISO-8859-1) which is
    966976         not mentioned elsewhere in the Accept-Charset field. If no "*" is present in an Accept-Charset field, then all character sets
    967977         not explicitly mentioned get a quality value of 0, except for ISO-8859-1, which gets a quality value of 1 if not explicitly
    968978         mentioned.
    969979      </p>
    970       <p id="rfc.section.5.2.p.6">If no Accept-Charset header is present, the default is that any character set is acceptable. If an Accept-Charset header is
     980      <p id="rfc.section.6.2.p.6">If no Accept-Charset header is present, the default is that any character set is acceptable. If an Accept-Charset header is
    971981         present, and if the server cannot send a response which is acceptable according to the Accept-Charset header, then the server <em class="bcp14">SHOULD</em> send an error response with the 406 (Not Acceptable) status code, though the sending of an unacceptable response is also allowed.
    972982      </p>
    973983      <div id="rfc.iref.a.3"></div>
    974984      <div id="rfc.iref.h.3"></div>
    975       <h2 id="rfc.section.5.3"><a href="#rfc.section.5.3">5.3</a>&nbsp;<a id="header.accept-encoding" href="#header.accept-encoding">Accept-Encoding</a></h2>
    976       <p id="rfc.section.5.3.p.1">The Accept-Encoding request-header field is similar to Accept, but restricts the content-codings (<a href="#content.codings" title="Content Codings">Section&nbsp;2.2</a>) that are acceptable in the response.
    977       </p>
    978       <div id="rfc.figure.u.20"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  Accept-Encoding  = "Accept-Encoding" ":"
     985      <h2 id="rfc.section.6.3"><a href="#rfc.section.6.3">6.3</a>&nbsp;<a id="header.accept-encoding" href="#header.accept-encoding">Accept-Encoding</a></h2>
     986      <p id="rfc.section.6.3.p.1">The Accept-Encoding request-header field is similar to Accept, but restricts the content-codings (<a href="#content.codings" title="Content Codings">Section&nbsp;3.2</a>) that are acceptable in the response.
     987      </p>
     988      <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.22"></span><span id="rfc.iref.g.23"></span>  Accept-Encoding  = "Accept-Encoding" ":"
    979989                     #( codings [ ";" "q" "=" qvalue ] )
    980990  codings          = ( content-coding | "*" )
    981 </pre><p id="rfc.section.5.3.p.3">Examples of its use are:</p>
    982       <div id="rfc.figure.u.21"></div><pre class="text">    Accept-Encoding: compress, gzip
     991</pre><p id="rfc.section.6.3.p.3">Examples of its use are:</p>
     992      <div id="rfc.figure.u.23"></div><pre class="text">    Accept-Encoding: compress, gzip
    983993    Accept-Encoding:
    984994    Accept-Encoding: *
    985995    Accept-Encoding: compress;q=0.5, gzip;q=1.0
    986996    Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0
    987 </pre><p id="rfc.section.5.3.p.5">A server tests whether a content-coding is acceptable, according to an Accept-Encoding field, using these rules: </p>
     997</pre><p id="rfc.section.6.3.p.5">A server tests whether a content-coding is acceptable, according to an Accept-Encoding field, using these rules: </p>
    988998      <ol>
    989999         <li>If the content-coding is one of the content-codings listed in the Accept-Encoding field, then it is acceptable, unless it
    990             is accompanied by a qvalue of 0. (As defined in <a href="#quality.values" title="Quality Values">Section&nbsp;2.4</a>, a qvalue of 0 means "not acceptable.")
     1000            is accompanied by a qvalue of 0. (As defined in <a href="#quality.values" title="Quality Values">Section&nbsp;3.4</a>, a qvalue of 0 means "not acceptable.")
    9911001         </li>
    9921002         <li>The special "*" symbol in an Accept-Encoding field matches any available content-coding not explicitly listed in the header
     
    9991009         </li>
    10001010      </ol>
    1001       <p id="rfc.section.5.3.p.6">If an Accept-Encoding field is present in a request, and if the server cannot send a response which is acceptable according
     1011      <p id="rfc.section.6.3.p.6">If an Accept-Encoding field is present in a request, and if the server cannot send a response which is acceptable according
    10021012         to the Accept-Encoding header, then the server <em class="bcp14">SHOULD</em> send an error response with the 406 (Not Acceptable) status code.
    10031013      </p>
    1004       <p id="rfc.section.5.3.p.7">If no Accept-Encoding field is present in a request, the server <em class="bcp14">MAY</em> assume that the client will accept any content coding. In this case, if "identity" is one of the available content-codings,
     1014      <p id="rfc.section.6.3.p.7">If no Accept-Encoding field is present in a request, the server <em class="bcp14">MAY</em> assume that the client will accept any content coding. In this case, if "identity" is one of the available content-codings,
    10051015         then the server <em class="bcp14">SHOULD</em> use the "identity" content-coding, unless it has additional information that a different content-coding is meaningful to the
    10061016         client.
     
    10181028      <div id="rfc.iref.a.4"></div>
    10191029      <div id="rfc.iref.h.4"></div>
    1020       <h2 id="rfc.section.5.4"><a href="#rfc.section.5.4">5.4</a>&nbsp;<a id="header.accept-language" href="#header.accept-language">Accept-Language</a></h2>
    1021       <p id="rfc.section.5.4.p.1">The Accept-Language request-header field is similar to Accept, but restricts the set of natural languages that are preferred
    1022          as a response to the request. Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;2.5</a>.
    1023       </p>
    1024       <div id="rfc.figure.u.22"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  Accept-Language = "Accept-Language" ":"
     1030      <h2 id="rfc.section.6.4"><a href="#rfc.section.6.4">6.4</a>&nbsp;<a id="header.accept-language" href="#header.accept-language">Accept-Language</a></h2>
     1031      <p id="rfc.section.6.4.p.1">The Accept-Language request-header field is similar to Accept, but restricts the set of natural languages that are preferred
     1032         as a response to the request. Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;3.5</a>.
     1033      </p>
     1034      <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.24"></span><span id="rfc.iref.g.25"></span>  Accept-Language = "Accept-Language" ":"
    10251035                    1#( language-range [ ";" "q" "=" qvalue ] )
    10261036  language-range  = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
    1027 </pre><p id="rfc.section.5.4.p.3">Each language-range <em class="bcp14">MAY</em> be given an associated quality value which represents an estimate of the user's preference for the languages specified by
     1037</pre><p id="rfc.section.6.4.p.3">Each language-range <em class="bcp14">MAY</em> be given an associated quality value which represents an estimate of the user's preference for the languages specified by
    10281038         that range. The quality value defaults to "q=1". For example,
    10291039      </p>
    1030       <div id="rfc.figure.u.23"></div><pre class="text">    Accept-Language: da, en-gb;q=0.8, en;q=0.7
    1031 </pre><p id="rfc.section.5.4.p.5">would mean: "I prefer Danish, but will accept British English and other types of English." A language-range matches a language-tag
     1040      <div id="rfc.figure.u.25"></div><pre class="text">    Accept-Language: da, en-gb;q=0.8, en;q=0.7
     1041</pre><p id="rfc.section.6.4.p.5">would mean: "I prefer Danish, but will accept British English and other types of English." A language-range matches a language-tag
    10321042         if it exactly equals the tag, or if it exactly equals a prefix of the tag such that the first tag character following the
    10331043         prefix is "-". The special range "*", if present in the Accept-Language field, matches every tag not matched by any other
     
    10401050         </dd>
    10411051      </dl>
    1042       <p id="rfc.section.5.4.p.6">The language quality factor assigned to a language-tag by the Accept-Language field is the quality value of the longest language-range
     1052      <p id="rfc.section.6.4.p.6">The language quality factor assigned to a language-tag by the Accept-Language field is the quality value of the longest language-range
    10431053         in the field that matches the language-tag. If no language-range in the field matches the tag, the language quality factor
    10441054         assigned is 0. If no Accept-Language header is present in the request, the server <em class="bcp14">SHOULD</em> assume that all languages are equally acceptable. If an Accept-Language header is present, then all languages which are assigned
    10451055         a quality factor greater than 0 are acceptable.
    10461056      </p>
    1047       <p id="rfc.section.5.4.p.7">It might be contrary to the privacy expectations of the user to send an Accept-Language header with the complete linguistic
    1048          preferences of the user in every request. For a discussion of this issue, see <a href="#privacy.issues.connected.to.accept.headers" title="Privacy Issues Connected to Accept Headers">Section&nbsp;7.1</a>.
    1049       </p>
    1050       <p id="rfc.section.5.4.p.8">As intelligibility is highly dependent on the individual user, it is recommended that client applications make the choice
     1057      <p id="rfc.section.6.4.p.7">It might be contrary to the privacy expectations of the user to send an Accept-Language header with the complete linguistic
     1058         preferences of the user in every request. For a discussion of this issue, see <a href="#privacy.issues.connected.to.accept.headers" title="Privacy Issues Connected to Accept Headers">Section&nbsp;8.1</a>.
     1059      </p>
     1060      <p id="rfc.section.6.4.p.8">As intelligibility is highly dependent on the individual user, it is recommended that client applications make the choice
    10511061         of linguistic preference available to the user. If the choice is not made available, then the Accept-Language header field <em class="bcp14">MUST NOT</em> be given in the request.
    10521062      </p>
     
    10601070      <div id="rfc.iref.c.2"></div>
    10611071      <div id="rfc.iref.h.5"></div>
    1062       <h2 id="rfc.section.5.5"><a href="#rfc.section.5.5">5.5</a>&nbsp;<a id="header.content-encoding" href="#header.content-encoding">Content-Encoding</a></h2>
    1063       <p id="rfc.section.5.5.p.1">The Content-Encoding entity-header field is used as a modifier to the media-type. When present, its value indicates what additional
     1072      <h2 id="rfc.section.6.5"><a href="#rfc.section.6.5">6.5</a>&nbsp;<a id="header.content-encoding" href="#header.content-encoding">Content-Encoding</a></h2>
     1073      <p id="rfc.section.6.5.p.1">The Content-Encoding entity-header field is used as a modifier to the media-type. When present, its value indicates what additional
    10641074         content codings have been applied to the entity-body, and thus what decoding mechanisms must be applied in order to obtain
    10651075         the media-type referenced by the Content-Type header field. Content-Encoding is primarily used to allow a document to be compressed
    10661076         without losing the identity of its underlying media type.
    10671077      </p>
    1068       <div id="rfc.figure.u.24"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  Content-Encoding  = "Content-Encoding" ":" 1#content-coding
    1069 </pre><p id="rfc.section.5.5.p.3">Content codings are defined in <a href="#content.codings" title="Content Codings">Section&nbsp;2.2</a>. An example of its use is
    1070       </p>
    1071       <div id="rfc.figure.u.25"></div><pre class="text">    Content-Encoding: gzip
    1072 </pre><p id="rfc.section.5.5.p.5">The content-coding is a characteristic of the entity identified by the Request-URI. Typically, the entity-body is stored with
     1078      <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.26"></span>  Content-Encoding  = "Content-Encoding" ":" 1#content-coding
     1079</pre><p id="rfc.section.6.5.p.3">Content codings are defined in <a href="#content.codings" title="Content Codings">Section&nbsp;3.2</a>. An example of its use is
     1080      </p>
     1081      <div id="rfc.figure.u.27"></div><pre class="text">    Content-Encoding: gzip
     1082</pre><p id="rfc.section.6.5.p.5">The content-coding is a characteristic of the entity identified by the Request-URI. Typically, the entity-body is stored with
    10731083         this encoding and is only decoded before rendering or analogous usage. However, a non-transparent proxy <em class="bcp14">MAY</em> modify the content-coding if the new coding is known to be acceptable to the recipient, unless the "no-transform" cache-control
    10741084         directive is present in the message.
    10751085      </p>
    1076       <p id="rfc.section.5.5.p.6">If the content-coding of an entity is not "identity", then the response <em class="bcp14">MUST</em> include a Content-Encoding entity-header (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.3" title="Content-Encoding">Section&nbsp;5.5</a>) that lists the non-identity content-coding(s) used.
    1077       </p>
    1078       <p id="rfc.section.5.5.p.7">If the content-coding of an entity in a request message is not acceptable to the origin server, the server <em class="bcp14">SHOULD</em> respond with a status code of 415 (Unsupported Media Type).
    1079       </p>
    1080       <p id="rfc.section.5.5.p.8">If multiple encodings have been applied to an entity, the content codings <em class="bcp14">MUST</em> be listed in the order in which they were applied. Additional information about the encoding parameters <em class="bcp14">MAY</em> be provided by other entity-header fields not defined by this specification.
     1086      <p id="rfc.section.6.5.p.6">If the content-coding of an entity is not "identity", then the response <em class="bcp14">MUST</em> include a Content-Encoding entity-header (<a href="#header.content-encoding" id="rfc.xref.header.content-encoding.3" title="Content-Encoding">Section&nbsp;6.5</a>) that lists the non-identity content-coding(s) used.
     1087      </p>
     1088      <p id="rfc.section.6.5.p.7">If the content-coding of an entity in a request message is not acceptable to the origin server, the server <em class="bcp14">SHOULD</em> respond with a status code of 415 (Unsupported Media Type).
     1089      </p>
     1090      <p id="rfc.section.6.5.p.8">If multiple encodings have been applied to an entity, the content codings <em class="bcp14">MUST</em> be listed in the order in which they were applied. Additional information about the encoding parameters <em class="bcp14">MAY</em> be provided by other entity-header fields not defined by this specification.
    10811091      </p>
    10821092      <div id="rfc.iref.c.3"></div>
    10831093      <div id="rfc.iref.h.6"></div>
    1084       <h2 id="rfc.section.5.6"><a href="#rfc.section.5.6">5.6</a>&nbsp;<a id="header.content-language" href="#header.content-language">Content-Language</a></h2>
    1085       <p id="rfc.section.5.6.p.1">The Content-Language entity-header field describes the natural language(s) of the intended audience for the enclosed entity.
     1094      <h2 id="rfc.section.6.6"><a href="#rfc.section.6.6">6.6</a>&nbsp;<a id="header.content-language" href="#header.content-language">Content-Language</a></h2>
     1095      <p id="rfc.section.6.6.p.1">The Content-Language entity-header field describes the natural language(s) of the intended audience for the enclosed entity.
    10861096         Note that this might not be equivalent to all the languages used within the entity-body.
    10871097      </p>
    1088       <div id="rfc.figure.u.26"></div><pre class="inline"><span id="rfc.iref.g.27"></span>  Content-Language  = "Content-Language" ":" 1#language-tag
    1089 </pre><p id="rfc.section.5.6.p.3">Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;2.5</a>. The primary purpose of Content-Language is to allow a user to identify and differentiate entities according to the user's
     1098      <div id="rfc.figure.u.28"></div><pre class="inline"><span id="rfc.iref.g.27"></span>  Content-Language  = "Content-Language" ":" 1#language-tag
     1099</pre><p id="rfc.section.6.6.p.3">Language tags are defined in <a href="#language.tags" title="Language Tags">Section&nbsp;3.5</a>. The primary purpose of Content-Language is to allow a user to identify and differentiate entities according to the user's
    10901100         own preferred language. Thus, if the body content is intended only for a Danish-literate audience, the appropriate field is
    10911101      </p>
    1092       <div id="rfc.figure.u.27"></div><pre class="text">    Content-Language: da
    1093 </pre><p id="rfc.section.5.6.p.5">If no Content-Language is specified, the default is that the content is intended for all language audiences. This might mean
     1102      <div id="rfc.figure.u.29"></div><pre class="text">    Content-Language: da
     1103</pre><p id="rfc.section.6.6.p.5">If no Content-Language is specified, the default is that the content is intended for all language audiences. This might mean
    10941104         that the sender does not consider it to be specific to any natural language, or that the sender does not know for which language
    10951105         it is intended.
    10961106      </p>
    1097       <p id="rfc.section.5.6.p.6">Multiple languages <em class="bcp14">MAY</em> be listed for content that is intended for multiple audiences. For example, a rendition of the "Treaty of Waitangi," presented
     1107      <p id="rfc.section.6.6.p.6">Multiple languages <em class="bcp14">MAY</em> be listed for content that is intended for multiple audiences. For example, a rendition of the "Treaty of Waitangi," presented
    10981108         simultaneously in the original Maori and English versions, would call for
    10991109      </p>
    1100       <div id="rfc.figure.u.28"></div><pre class="text">    Content-Language: mi, en
    1101 </pre><p id="rfc.section.5.6.p.8">However, just because multiple languages are present within an entity does not mean that it is intended for multiple linguistic
     1110      <div id="rfc.figure.u.30"></div><pre class="text">    Content-Language: mi, en
     1111</pre><p id="rfc.section.6.6.p.8">However, just because multiple languages are present within an entity does not mean that it is intended for multiple linguistic
    11021112         audiences. An example would be a beginner's language primer, such as "A First Lesson in Latin," which is clearly intended
    11031113         to be used by an English-literate audience. In this case, the Content-Language would properly only include "en".
    11041114      </p>
    1105       <p id="rfc.section.5.6.p.9">Content-Language <em class="bcp14">MAY</em> be applied to any media type -- it is not limited to textual documents.
     1115      <p id="rfc.section.6.6.p.9">Content-Language <em class="bcp14">MAY</em> be applied to any media type -- it is not limited to textual documents.
    11061116      </p>
    11071117      <div id="rfc.iref.c.4"></div>
    11081118      <div id="rfc.iref.h.7"></div>
    1109       <h2 id="rfc.section.5.7"><a href="#rfc.section.5.7">5.7</a>&nbsp;<a id="header.content-location" href="#header.content-location">Content-Location</a></h2>
    1110       <p id="rfc.section.5.7.p.1">The Content-Location entity-header field <em class="bcp14">MAY</em> be used to supply the resource location for the entity enclosed in the message when that entity is accessible from a location
     1119      <h2 id="rfc.section.6.7"><a href="#rfc.section.6.7">6.7</a>&nbsp;<a id="header.content-location" href="#header.content-location">Content-Location</a></h2>
     1120      <p id="rfc.section.6.7.p.1">The Content-Location entity-header field <em class="bcp14">MAY</em> be used to supply the resource location for the entity enclosed in the message when that entity is accessible from a location
    11111121         separate from the requested resource's URI. A server <em class="bcp14">SHOULD</em> provide a Content-Location for the variant corresponding to the response entity; especially in the case where a resource has
    11121122         multiple entities associated with it, and those entities actually have separate locations by which they might be individually
    11131123         accessed, the server <em class="bcp14">SHOULD</em> provide a Content-Location for the particular variant which is returned.
    11141124      </p>
    1115       <div id="rfc.figure.u.29"></div><pre class="inline"><span id="rfc.iref.g.28"></span>  Content-Location = "Content-Location" ":"
     1125      <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.28"></span>  Content-Location = "Content-Location" ":"
    11161126                    ( absoluteURI | relativeURI )
    1117 </pre><p id="rfc.section.5.7.p.3">The value of Content-Location also defines the base URI for the entity.</p>
    1118       <p id="rfc.section.5.7.p.4">The Content-Location value is not a replacement for the original requested URI; it is only a statement of the location of
     1127</pre><p id="rfc.section.6.7.p.3">The value of Content-Location also defines the base URI for the entity.</p>
     1128      <p id="rfc.section.6.7.p.4">The Content-Location value is not a replacement for the original requested URI; it is only a statement of the location of
    11191129         the resource corresponding to this particular entity at the time of the request. Future requests <em class="bcp14">MAY</em> specify the Content-Location URI as the request-URI if the desire is to identify the source of that particular entity.
    11201130      </p>
    1121       <p id="rfc.section.5.7.p.5">A cache cannot assume that an entity with a Content-Location different from the URI used to retrieve it can be used to respond
     1131      <p id="rfc.section.6.7.p.5">A cache cannot assume that an entity with a Content-Location different from the URI used to retrieve it can be used to respond
    11221132         to later requests on that Content-Location URI. However, the Content-Location can be used to differentiate between multiple
    1123          entities retrieved from a single requested resource, as described in <a href="p6-cache.html#caching.negotiated.responses" title="Caching Negotiated Responses">Section 7</a> of <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>.
    1124       </p>
    1125       <p id="rfc.section.5.7.p.6">If the Content-Location is a relative URI, the relative URI is interpreted relative to the Request-URI.</p>
    1126       <p id="rfc.section.5.7.p.7">The meaning of the Content-Location header in PUT or POST requests is undefined; servers are free to ignore it in those cases.</p>
     1133         entities retrieved from a single requested resource, as described in <a href="p6-cache.html#caching.negotiated.responses" title="Caching Negotiated Responses">Section 8</a> of <a href="#Part6" id="rfc.xref.Part6.3"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>.
     1134      </p>
     1135      <p id="rfc.section.6.7.p.6">If the Content-Location is a relative URI, the relative URI is interpreted relative to the Request-URI.</p>
     1136      <p id="rfc.section.6.7.p.7">The meaning of the Content-Location header in PUT or POST requests is undefined; servers are free to ignore it in those cases.</p>
    11271137      <div id="rfc.iref.c.5"></div>
    11281138      <div id="rfc.iref.h.8"></div>
    1129       <h2 id="rfc.section.5.8"><a href="#rfc.section.5.8">5.8</a>&nbsp;<a id="header.content-md5" href="#header.content-md5">Content-MD5</a></h2>
    1130       <p id="rfc.section.5.8.p.1">The Content-MD5 entity-header field, as defined in <a href="#RFC1864" id="rfc.xref.RFC1864.1"><cite title="The Content-MD5 Header Field">[RFC1864]</cite></a>, is an MD5 digest of the entity-body for the purpose of providing an end-to-end message integrity check (MIC) of the entity-body.
     1139      <h2 id="rfc.section.6.8"><a href="#rfc.section.6.8">6.8</a>&nbsp;<a id="header.content-md5" href="#header.content-md5">Content-MD5</a></h2>
     1140      <p id="rfc.section.6.8.p.1">The Content-MD5 entity-header field, as defined in <a href="#RFC1864" id="rfc.xref.RFC1864.1"><cite title="The Content-MD5 Header Field">[RFC1864]</cite></a>, is an MD5 digest of the entity-body for the purpose of providing an end-to-end message integrity check (MIC) of the entity-body.
    11311141         (Note: a MIC is good for detecting accidental modification of the entity-body in transit, but is not proof against malicious
    11321142         attacks.)
    11331143      </p>
    1134       <div id="rfc.figure.u.30"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  Content-MD5   = "Content-MD5" ":" md5-digest
     1144      <div id="rfc.figure.u.32"></div><pre class="inline"><span id="rfc.iref.g.29"></span><span id="rfc.iref.g.30"></span>  Content-MD5   = "Content-MD5" ":" md5-digest
    11351145  md5-digest    = &lt;base64 of 128 bit MD5 digest as per <a href="#RFC1864" id="rfc.xref.RFC1864.2"><cite title="The Content-MD5 Header Field">[RFC1864]</cite></a>&gt;
    1136 </pre><p id="rfc.section.5.8.p.3">The Content-MD5 header field <em class="bcp14">MAY</em> be generated by an origin server or client to function as an integrity check of the entity-body. Only origin servers or clients <em class="bcp14">MAY</em> generate the Content-MD5 header field; proxies and gateways <em class="bcp14">MUST NOT</em> generate it, as this would defeat its value as an end-to-end integrity check. Any recipient of the entity-body, including
     1146</pre><p id="rfc.section.6.8.p.3">The Content-MD5 header field <em class="bcp14">MAY</em> be generated by an origin server or client to function as an integrity check of the entity-body. Only origin servers or clients <em class="bcp14">MAY</em> generate the Content-MD5 header field; proxies and gateways <em class="bcp14">MUST NOT</em> generate it, as this would defeat its value as an end-to-end integrity check. Any recipient of the entity-body, including
    11371147         gateways and proxies, <em class="bcp14">MAY</em> check that the digest value in this header field matches that of the entity-body as received.
    11381148      </p>
    1139       <p id="rfc.section.5.8.p.4">The MD5 digest is computed based on the content of the entity-body, including any content-coding that has been applied, but
     1149      <p id="rfc.section.6.8.p.4">The MD5 digest is computed based on the content of the entity-body, including any content-coding that has been applied, but
    11401150         not including any transfer-encoding applied to the message-body. If the message is received with a transfer-encoding, that
    11411151         encoding <em class="bcp14">MUST</em> be removed prior to checking the Content-MD5 value against the received entity.
    11421152      </p>
    1143       <p id="rfc.section.5.8.p.5">This has the result that the digest is computed on the octets of the entity-body exactly as, and in the order that, they would
     1153      <p id="rfc.section.6.8.p.5">This has the result that the digest is computed on the octets of the entity-body exactly as, and in the order that, they would
    11441154         be sent if no transfer-encoding were being applied.
    11451155      </p>
    1146       <p id="rfc.section.5.8.p.6">HTTP extends RFC 1864 to permit the digest to be computed for MIME composite media-types (e.g., multipart/* and message/rfc822),
     1156      <p id="rfc.section.6.8.p.6">HTTP extends RFC 1864 to permit the digest to be computed for MIME composite media-types (e.g., multipart/* and message/rfc822),
    11471157         but this does not change how the digest is computed as defined in the preceding paragraph.
    11481158      </p>
    1149       <p id="rfc.section.5.8.p.7">There are several consequences of this. The entity-body for composite types <em class="bcp14">MAY</em> contain many body-parts, each with its own MIME and HTTP headers (including Content-MD5, Content-Transfer-Encoding, and Content-Encoding
     1159      <p id="rfc.section.6.8.p.7">There are several consequences of this. The entity-body for composite types <em class="bcp14">MAY</em> contain many body-parts, each with its own MIME and HTTP headers (including Content-MD5, Content-Transfer-Encoding, and Content-Encoding
    11501160         headers). If a body-part has a Content-Transfer-Encoding or Content-Encoding header, it is assumed that the content of the
    11511161         body-part has had the encoding applied, and the body-part is included in the Content-MD5 digest as is -- i.e., after the application.
    11521162         The Transfer-Encoding header field is not allowed within body-parts.
    11531163      </p>
    1154       <p id="rfc.section.5.8.p.8">Conversion of all line breaks to CRLF <em class="bcp14">MUST NOT</em> be done before computing or checking the digest: the line break convention used in the text actually transmitted <em class="bcp14">MUST</em> be left unaltered when computing the digest.
     1164      <p id="rfc.section.6.8.p.8">Conversion of all line breaks to CRLF <em class="bcp14">MUST NOT</em> be done before computing or checking the digest: the line break convention used in the text actually transmitted <em class="bcp14">MUST</em> be left unaltered when computing the digest.
    11551165      </p>
    11561166      <dl class="empty">
     
    11651175      <div id="rfc.iref.c.6"></div>
    11661176      <div id="rfc.iref.h.9"></div>
    1167       <h2 id="rfc.section.5.9"><a href="#rfc.section.5.9">5.9</a>&nbsp;<a id="header.content-type" href="#header.content-type">Content-Type</a></h2>
    1168       <p id="rfc.section.5.9.p.1">The Content-Type entity-header field indicates the media type of the entity-body sent to the recipient or, in the case of
     1177      <h2 id="rfc.section.6.9"><a href="#rfc.section.6.9">6.9</a>&nbsp;<a id="header.content-type" href="#header.content-type">Content-Type</a></h2>
     1178      <p id="rfc.section.6.9.p.1">The Content-Type entity-header field indicates the media type of the entity-body sent to the recipient or, in the case of
    11691179         the HEAD method, the media type that would have been sent had the request been a GET.
    11701180      </p>
    1171       <div id="rfc.figure.u.31"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  Content-Type   = "Content-Type" ":" media-type
    1172 </pre><p id="rfc.section.5.9.p.3">Media types are defined in <a href="#media.types" title="Media Types">Section&nbsp;2.3</a>. An example of the field is
    1173       </p>
    1174       <div id="rfc.figure.u.32"></div><pre class="text">    Content-Type: text/html; charset=ISO-8859-4
    1175 </pre><p id="rfc.section.5.9.p.5">Further discussion of methods for identifying the media type of an entity is provided in <a href="#type" title="Type">Section&nbsp;3.2.1</a>.
    1176       </p>
    1177       <h1 id="rfc.section.6"><a href="#rfc.section.6">6.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
    1178       <p id="rfc.section.6.p.1"> <span class="comment">[rfc.comment.1: TBD.]</span>
    1179       </p>
    1180       <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
    1181       <p id="rfc.section.7.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
     1181      <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.31"></span>  Content-Type   = "Content-Type" ":" media-type
     1182</pre><p id="rfc.section.6.9.p.3">Media types are defined in <a href="#media.types" title="Media Types">Section&nbsp;3.3</a>. An example of the field is
     1183      </p>
     1184      <div id="rfc.figure.u.34"></div><pre class="text">    Content-Type: text/html; charset=ISO-8859-4
     1185</pre><p id="rfc.section.6.9.p.5">Further discussion of methods for identifying the media type of an entity is provided in <a href="#type" title="Type">Section&nbsp;4.2.1</a>.
     1186      </p>
     1187      <h1 id="rfc.section.7"><a href="#rfc.section.7">7.</a>&nbsp;<a id="IANA.considerations" href="#IANA.considerations">IANA Considerations</a></h1>
     1188      <p id="rfc.section.7.p.1"> <span class="comment">[rfc.comment.1: TBD.]</span>
     1189      </p>
     1190      <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="security.considerations" href="#security.considerations">Security Considerations</a></h1>
     1191      <p id="rfc.section.8.p.1">This section is meant to inform application developers, information providers, and users of the security limitations in HTTP/1.1
    11821192         as described by this document. The discussion does not include definitive solutions to the problems revealed, though it does
    11831193         make some suggestions for reducing security risks.
    11841194      </p>
    1185       <h2 id="rfc.section.7.1"><a href="#rfc.section.7.1">7.1</a>&nbsp;<a id="privacy.issues.connected.to.accept.headers" href="#privacy.issues.connected.to.accept.headers">Privacy Issues Connected to Accept Headers</a></h2>
    1186       <p id="rfc.section.7.1.p.1">Accept request-headers can reveal information about the user to all servers which are accessed. The Accept-Language header
     1195      <h2 id="rfc.section.8.1"><a href="#rfc.section.8.1">8.1</a>&nbsp;<a id="privacy.issues.connected.to.accept.headers" href="#privacy.issues.connected.to.accept.headers">Privacy Issues Connected to Accept Headers</a></h2>
     1196      <p id="rfc.section.8.1.p.1">Accept request-headers can reveal information about the user to all servers which are accessed. The Accept-Language header
    11871197         in particular can reveal information the user would consider to be of a private nature, because the understanding of particular
    11881198         languages is often strongly correlated to the membership of a particular ethnic group. User agents which offer the option
     
    11901200         process include a message which makes the user aware of the loss of privacy involved.
    11911201      </p>
    1192       <p id="rfc.section.7.1.p.2">An approach that limits the loss of privacy would be for a user agent to omit the sending of Accept-Language headers by default,
     1202      <p id="rfc.section.8.1.p.2">An approach that limits the loss of privacy would be for a user agent to omit the sending of Accept-Language headers by default,
    11931203         and to ask the user whether or not to start sending Accept-Language headers to a server if it detects, by looking for any
    11941204         Vary response-header fields generated by the server, that such sending could improve the quality of service.
    11951205      </p>
    1196       <p id="rfc.section.7.1.p.3">Elaborate user-customized accept header fields sent in every request, in particular if these include quality values, can be
     1206      <p id="rfc.section.8.1.p.3">Elaborate user-customized accept header fields sent in every request, in particular if these include quality values, can be
    11971207         used by servers as relatively reliable and long-lived user identifiers. Such user identifiers would allow content providers
    11981208         to do click-trail tracking, and would allow collaborating content providers to match cross-server click-trails or form submissions
     
    12021212         filter the accept headers in relayed requests. General purpose user agents which provide a high degree of header configurability <em class="bcp14">SHOULD</em> warn users about the loss of privacy which can be involved.
    12031213      </p>
    1204       <h2 id="rfc.section.7.2"><a href="#rfc.section.7.2">7.2</a>&nbsp;<a id="content-disposition.issues" href="#content-disposition.issues">Content-Disposition Issues</a></h2>
    1205       <p id="rfc.section.7.2.p.1"> <a href="#RFC1806" id="rfc.xref.RFC1806.1"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header">[RFC1806]</cite></a>, from which the often implemented Content-Disposition (see <a href="#content-disposition" id="rfc.xref.content-disposition.1" title="Content-Disposition">Appendix&nbsp;B.1</a>) header in HTTP is derived, has a number of very serious security considerations. Content-Disposition is not part of the
     1214      <h2 id="rfc.section.8.2"><a href="#rfc.section.8.2">8.2</a>&nbsp;<a id="content-disposition.issues" href="#content-disposition.issues">Content-Disposition Issues</a></h2>
     1215      <p id="rfc.section.8.2.p.1"> <a href="#RFC1806" id="rfc.xref.RFC1806.1"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header">[RFC1806]</cite></a>, from which the often implemented Content-Disposition (see <a href="#content-disposition" id="rfc.xref.content-disposition.1" title="Content-Disposition">Appendix&nbsp;B.1</a>) header in HTTP is derived, has a number of very serious security considerations. Content-Disposition is not part of the
    12061216         HTTP standard, but since it is widely implemented, we are documenting its use and risks for implementors. See <a href="#RFC2183" id="rfc.xref.RFC2183.1"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field">[RFC2183]</cite></a> (which updates <a href="#RFC1806" id="rfc.xref.RFC1806.2"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header">[RFC1806]</cite></a>) for details.
    12071217      </p>
    1208       <h1 id="rfc.section.8"><a href="#rfc.section.8">8.</a>&nbsp;<a id="ack" href="#ack">Acknowledgments</a></h1>
    1209       <h1 id="rfc.references"><a id="rfc.section.9" href="#rfc.section.9">9.</a> References
     1218      <h1 id="rfc.section.9"><a href="#rfc.section.9">9.</a>&nbsp;<a id="ack" href="#ack">Acknowledgments</a></h1>
     1219      <h1 id="rfc.references"><a id="rfc.section.10" href="#rfc.section.10">10.</a> References
    12101220      </h1>
    1211       <h2 id="rfc.references.1"><a href="#rfc.section.9.1" id="rfc.section.9.1">9.1</a> Normative References
     1221      <h2 id="rfc.references.1"><a href="#rfc.section.10.1" id="rfc.section.10.1">10.1</a> Normative References
    12121222      </h2>
    12131223      <table summary="Normative References">                           
     
    12881298         </tr>
    12891299      </table>
    1290       <h2 id="rfc.references.2"><a href="#rfc.section.9.2" id="rfc.section.9.2">9.2</a> Informative References
     1300      <h2 id="rfc.references.2"><a href="#rfc.section.10.2" id="rfc.section.10.2">10.2</a> Informative References
    12911301      </h2>
    12921302      <table summary="Informative References">                         
     
    13881398         environments.
    13891399      </p>
    1390       <div id="rfc.figure.u.33"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  MIME-Version   = "MIME-Version" ":" 1*DIGIT "." 1*DIGIT
     1400      <div id="rfc.figure.u.35"></div><pre class="inline"><span id="rfc.iref.g.32"></span>  MIME-Version   = "MIME-Version" ":" 1*DIGIT "." 1*DIGIT
    13911401</pre><p id="rfc.section.A.1.p.3">MIME version "1.0" is the default for use in HTTP/1.1. However, HTTP/1.1 message parsing and semantics are defined by this
    13921402         document and not the MIME specification.
    13931403      </p>
    13941404      <h2 id="rfc.section.A.2"><a href="#rfc.section.A.2">A.2</a>&nbsp;<a id="conversion.to.canonical.form" href="#conversion.to.canonical.form">Conversion to Canonical Form</a></h2>
    1395       <p id="rfc.section.A.2.p.1"> <a href="#RFC2045" id="rfc.xref.RFC2045.3"><cite title="Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies">[RFC2045]</cite></a> requires that an Internet mail entity be converted to canonical form prior to being transferred, as described in <a href="http://tools.ietf.org/html/rfc2049#section-4">Section 4</a> of <a href="#RFC2049" id="rfc.xref.RFC2049.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples">[RFC2049]</cite></a>. <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;2.3.1</a> of this document describes the forms allowed for subtypes of the "text" media type when transmitted over HTTP. <a href="#RFC2046" id="rfc.xref.RFC2046.3"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> requires that content with a type of "text" represent line breaks as CRLF and forbids the use of CR or LF outside of line
     1405      <p id="rfc.section.A.2.p.1"> <a href="#RFC2045" id="rfc.xref.RFC2045.3"><cite title="Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies">[RFC2045]</cite></a> requires that an Internet mail entity be converted to canonical form prior to being transferred, as described in <a href="http://tools.ietf.org/html/rfc2049#section-4">Section 4</a> of <a href="#RFC2049" id="rfc.xref.RFC2049.1"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples">[RFC2049]</cite></a>. <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;3.3.1</a> of this document describes the forms allowed for subtypes of the "text" media type when transmitted over HTTP. <a href="#RFC2046" id="rfc.xref.RFC2046.3"><cite title="Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types">[RFC2046]</cite></a> requires that content with a type of "text" represent line breaks as CRLF and forbids the use of CR or LF outside of line
    13961406         break sequences. HTTP allows CRLF, bare CR, and bare LF to indicate a line break within text content when a message is transmitted
    13971407         over HTTP.
    13981408      </p>
    1399       <p id="rfc.section.A.2.p.2">Where it is possible, a proxy or gateway from HTTP to a strict MIME environment <em class="bcp14">SHOULD</em> translate all line breaks within the text media types described in <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;2.3.1</a> of this document to the RFC 2049 canonical form of CRLF. Note, however, that this might be complicated by the presence of
     1409      <p id="rfc.section.A.2.p.2">Where it is possible, a proxy or gateway from HTTP to a strict MIME environment <em class="bcp14">SHOULD</em> translate all line breaks within the text media types described in <a href="#canonicalization.and.text.defaults" title="Canonicalization and Text Defaults">Section&nbsp;3.3.1</a> of this document to the RFC 2049 canonical form of CRLF. Note, however, that this might be complicated by the presence of
    14001410         a Content-Encoding and by the fact that HTTP allows the use of some character sets which do not use octets 13 and 10 to represent
    14011411         CR and LF, as is the case for some multi-byte character sets.
     
    14201430      </p>
    14211431      <h2 id="rfc.section.A.5"><a href="#rfc.section.A.5">A.5</a>&nbsp;<a id="introduction.of.transfer-encoding" href="#introduction.of.transfer-encoding">Introduction of Transfer-Encoding</a></h2>
    1422       <p id="rfc.section.A.5.p.1">HTTP/1.1 introduces the Transfer-Encoding header field (<a href="p1-messaging.html#header.transfer-encoding" title="Transfer-Encoding">Section 8.7</a> of <a href="#Part1" id="rfc.xref.Part1.4"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Proxies/gateways <em class="bcp14">MUST</em> remove any transfer-coding prior to forwarding a message via a MIME-compliant protocol.
     1432      <p id="rfc.section.A.5.p.1">HTTP/1.1 introduces the Transfer-Encoding header field (<a href="p1-messaging.html#header.transfer-encoding" title="Transfer-Encoding">Section 8.7</a> of <a href="#Part1" id="rfc.xref.Part1.11"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>). Proxies/gateways <em class="bcp14">MUST</em> remove any transfer-coding prior to forwarding a message via a MIME-compliant protocol.
    14231433      </p>
    14241434      <h2 id="rfc.section.A.6"><a href="#rfc.section.A.6">A.6</a>&nbsp;<a id="mhtml.line.length" href="#mhtml.line.length">MHTML and Line Length Limitations</a></h2>
    14251435      <p id="rfc.section.A.6.p.1">HTTP implementations which share code with MHTML <a href="#RFC2557" id="rfc.xref.RFC2557.1"><cite title="MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)">[RFC2557]</cite></a> implementations need to be aware of MIME line length limitations. Since HTTP does not have this limitation, HTTP does not
    14261436         fold long lines. MHTML messages being transported by HTTP follow all conventions of MHTML, including line length limitations
    1427          and folding, canonicalization, etc., since HTTP transports all message-bodies as payload (see <a href="#multipart.types" title="Multipart Types">Section&nbsp;2.3.2</a>) and does not interpret the content or any MIME header lines that might be contained therein.
     1437         and folding, canonicalization, etc., since HTTP transports all message-bodies as payload (see <a href="#multipart.types" title="Multipart Types">Section&nbsp;3.3.2</a>) and does not interpret the content or any MIME header lines that might be contained therein.
    14281438      </p>
    14291439      <h1 id="rfc.section.B"><a href="#rfc.section.B">B.</a>&nbsp;<a id="additional.features" href="#additional.features">Additional Features</a></h1>
     
    14421452         in <a href="#RFC1806" id="rfc.xref.RFC1806.3"><cite title="Communicating Presentation Information in Internet Messages: The Content-Disposition Header">[RFC1806]</cite></a>.
    14431453      </p>
    1444       <div id="rfc.figure.u.34"></div><pre class="inline"><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span>  content-disposition = "Content-Disposition" ":"
     1454      <div id="rfc.figure.u.36"></div><pre class="inline"><span id="rfc.iref.g.33"></span><span id="rfc.iref.g.34"></span><span id="rfc.iref.g.35"></span><span id="rfc.iref.g.36"></span><span id="rfc.iref.g.37"></span><span id="rfc.iref.g.38"></span>  content-disposition = "Content-Disposition" ":"
    14451455                        disposition-type *( ";" disposition-parm )
    14461456  disposition-type = "attachment" | disp-extension-token
     
    14501460  disp-extension-parm = token "=" ( token | quoted-string )
    14511461</pre><p id="rfc.section.B.1.p.3">An example is</p>
    1452       <div id="rfc.figure.u.35"></div><pre class="text">     Content-Disposition: attachment; filename="fname.ext"
     1462      <div id="rfc.figure.u.37"></div><pre class="text">     Content-Disposition: attachment; filename="fname.ext"
    14531463</pre><p id="rfc.section.B.1.p.5">The receiving user agent <em class="bcp14">SHOULD NOT</em> respect any directory path information present in the filename-parm parameter, which is the only parameter believed to apply
    14541464         to HTTP implementations at this time. The filename <em class="bcp14">SHOULD</em> be treated as a terminal component only.
     
    14571467         agent should not display the response, but directly enter a `save response as...' dialog.
    14581468      </p>
    1459       <p id="rfc.section.B.1.p.7">See <a href="#content-disposition.issues" title="Content-Disposition Issues">Section&nbsp;7.2</a> for Content-Disposition security issues.
     1469      <p id="rfc.section.B.1.p.7">See <a href="#content-disposition.issues" title="Content-Disposition Issues">Section&nbsp;8.2</a> for Content-Disposition security issues.
    14601470      </p>
    14611471      <h1 id="rfc.section.C"><a href="#rfc.section.C">C.</a>&nbsp;<a id="compatibility" href="#compatibility">Compatibility with Previous Versions</a></h1>
     
    14631473      <p id="rfc.section.C.1.p.1">Transfer-coding and message lengths all interact in ways that required fixing exactly when chunked encoding is used (to allow
    14641474         for transfer encoding that may not be self delimiting); it was important to straighten out exactly how message lengths are
    1465          computed. (<a href="#entity.length" title="Entity Length">Section&nbsp;3.2.2</a>, see also <a href="#Part1" id="rfc.xref.Part1.5"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> and <a href="#Part6" id="rfc.xref.Part6.4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
    1466       </p>
    1467       <p id="rfc.section.C.1.p.2">Charset wildcarding is introduced to avoid explosion of character set names in accept headers. (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.2" title="Accept-Charset">Section&nbsp;5.2</a>)
     1475         computed. (<a href="#entity.length" title="Entity Length">Section&nbsp;4.2.2</a>, see also <a href="#Part1" id="rfc.xref.Part1.12"><cite title="HTTP/1.1, part 1: URIs, Connections, and Message Parsing">[Part1]</cite></a>, <a href="#Part5" id="rfc.xref.Part5.3"><cite title="HTTP/1.1, part 5: Range Requests and Partial Responses">[Part5]</cite></a> and <a href="#Part6" id="rfc.xref.Part6.4"><cite title="HTTP/1.1, part 6: Caching">[Part6]</cite></a>).
     1476      </p>
     1477      <p id="rfc.section.C.1.p.2">Charset wildcarding is introduced to avoid explosion of character set names in accept headers. (<a href="#header.accept-charset" id="rfc.xref.header.accept-charset.2" title="Accept-Charset">Section&nbsp;6.2</a>)
    14681478      </p>
    14691479      <p id="rfc.section.C.1.p.3">Content-Base was deleted from the specification: it was not implemented widely, and there is no simple, safe way to introduce
    14701480         it without a robust extension mechanism. In addition, it is used in a similar, but not identical fashion in MHTML <a href="#RFC2557" id="rfc.xref.RFC2557.2"><cite title="MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)">[RFC2557]</cite></a>.
    14711481      </p>
    1472       <p id="rfc.section.C.1.p.4">A content-coding of "identity" was introduced, to solve problems discovered in caching. (<a href="#content.codings" title="Content Codings">Section&nbsp;2.2</a>)
    1473       </p>
    1474       <p id="rfc.section.C.1.p.5">Quality Values of zero should indicate that "I don't want something" to allow clients to refuse a representation. (<a href="#quality.values" title="Quality Values">Section&nbsp;2.4</a>)
     1482      <p id="rfc.section.C.1.p.4">A content-coding of "identity" was introduced, to solve problems discovered in caching. (<a href="#content.codings" title="Content Codings">Section&nbsp;3.2</a>)
     1483      </p>
     1484      <p id="rfc.section.C.1.p.5">Quality Values of zero should indicate that "I don't want something" to allow clients to refuse a representation. (<a href="#quality.values" title="Quality Values">Section&nbsp;3.4</a>)
    14751485      </p>
    14761486      <p id="rfc.section.C.1.p.6">The Alternates<span id="rfc.iref.a.5"></span><span id="rfc.iref.h.11"></span>, Content-Version<span id="rfc.iref.c.8"></span><span id="rfc.iref.h.12"></span>, Derived-From<span id="rfc.iref.d.2"></span><span id="rfc.iref.h.13"></span>, Link<span id="rfc.iref.l.1"></span><span id="rfc.iref.h.14"></span>, URI<span id="rfc.iref.u.1"></span><span id="rfc.iref.h.15"></span>, Public<span id="rfc.iref.p.1"></span><span id="rfc.iref.h.16"></span> and Content-Base<span id="rfc.iref.c.9"></span><span id="rfc.iref.h.17"></span> header fields were defined in previous versions of this specification, but not commonly implemented. See <a href="#RFC2068" id="rfc.xref.RFC2068.5"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>.
    14771487      </p>
    14781488      <h2 id="rfc.section.C.2"><a href="#rfc.section.C.2">C.2</a>&nbsp;<a id="changes.from.rfc.2616" href="#changes.from.rfc.2616">Changes from RFC 2616</a></h2>
    1479       <p id="rfc.section.C.2.p.1">Clarify contexts that charset is used in. (<a href="#character.sets" title="Character Sets">Section&nbsp;2.1</a>)
     1489      <p id="rfc.section.C.2.p.1">Clarify contexts that charset is used in. (<a href="#character.sets" title="Character Sets">Section&nbsp;3.1</a>)
    14801490      </p>
    14811491      <p id="rfc.section.C.2.p.2">Remove reference to non-existant identity transfer-coding value tokens. (<a href="#no.content-transfer-encoding" title="No Content-Transfer-Encoding">Appendix&nbsp;A.4</a>)
     
    15161526      <h2 id="rfc.section.D.3"><a href="#rfc.section.D.3">D.3</a>&nbsp;Since draft-ietf-httpbis-p3-payload-01
    15171527      </h2>
     1528      <p id="rfc.section.D.3.p.1">Ongoing work on ABNF conversion (&lt;<a href="http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36">http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36</a>&gt;):
     1529      </p>
     1530      <ul>
     1531         <li>Add explicit references to BNF syntax and rules imported from other parts of the specification.</li>
     1532      </ul>
    15181533      <h1><a id="rfc.copyright" href="#rfc.copyright">Full Copyright Statement</a></h1>
    15191534      <p>Copyright © The IETF Trust (2008).</p>
     
    15491564         <ul class="ind">
    15501565            <li class="indline0"><a id="rfc.index.A" href="#rfc.index.A"><b>A</b></a><ul class="ind">
    1551                   <li class="indline1">Accept header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept.1">2.3</a>, <a class="iref" href="#rfc.xref.header.accept.2">4.1</a>, <a class="iref" href="#rfc.iref.a.1"><b>5.1</b></a></li>
    1552                   <li class="indline1">Accept-Charset header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-charset.1">4.1</a>, <a class="iref" href="#rfc.iref.a.2"><b>5.2</b></a>, <a class="iref" href="#rfc.xref.header.accept-charset.2">C.1</a></li>
    1553                   <li class="indline1">Accept-Encoding header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-encoding.1">2.2</a>, <a class="iref" href="#rfc.xref.header.accept-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.a.3"><b>5.3</b></a></li>
    1554                   <li class="indline1">Accept-Language header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-language.1">4.1</a>, <a class="iref" href="#rfc.iref.a.4"><b>5.4</b></a></li>
     1566                  <li class="indline1">Accept header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept.1">3.3</a>, <a class="iref" href="#rfc.xref.header.accept.2">5.1</a>, <a class="iref" href="#rfc.iref.a.1"><b>6.1</b></a></li>
     1567                  <li class="indline1">Accept-Charset header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-charset.1">5.1</a>, <a class="iref" href="#rfc.iref.a.2"><b>6.2</b></a>, <a class="iref" href="#rfc.xref.header.accept-charset.2">C.1</a></li>
     1568                  <li class="indline1">Accept-Encoding header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.accept-encoding.2">5.1</a>, <a class="iref" href="#rfc.iref.a.3"><b>6.3</b></a></li>
     1569                  <li class="indline1">Accept-Language header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-language.1">5.1</a>, <a class="iref" href="#rfc.iref.a.4"><b>6.4</b></a></li>
    15551570                  <li class="indline1">Alternates header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.a.5"><b>C.1</b></a></li>
    15561571               </ul>
    15571572            </li>
    15581573            <li class="indline0"><a id="rfc.index.C" href="#rfc.index.C"><b>C</b></a><ul class="ind">
    1559                   <li class="indline1">compress&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.1">2.2</a></li>
     1574                  <li class="indline1">compress&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.1">3.2</a></li>
    15601575                  <li class="indline1">Content-Base header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.9"><b>C.1</b></a></li>
    1561                   <li class="indline1">Content-Disposition header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">7.2</a>, <a class="iref" href="#rfc.iref.c.7"><b>B.1</b></a></li>
    1562                   <li class="indline1">Content-Encoding header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">2.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">3.1</a>, <a class="iref" href="#rfc.iref.c.2"><b>5.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">5.5</a></li>
    1563                   <li class="indline1">Content-Language header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">3.1</a>, <a class="iref" href="#rfc.iref.c.3"><b>5.6</b></a></li>
    1564                   <li class="indline1">Content-Location header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-location.1">3.1</a>, <a class="iref" href="#rfc.iref.c.4"><b>5.7</b></a></li>
    1565                   <li class="indline1">Content-MD5 header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-md5.1">3.1</a>, <a class="iref" href="#rfc.iref.c.5"><b>5.8</b></a></li>
    1566                   <li class="indline1">Content-Type header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-type.1">2.3</a>, <a class="iref" href="#rfc.xref.header.content-type.2">3.1</a>, <a class="iref" href="#rfc.iref.c.6"><b>5.9</b></a></li>
     1576                  <li class="indline1">Content-Disposition header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.c.7"><b>B.1</b></a></li>
     1577                  <li class="indline1">Content-Encoding header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.c.2"><b>6.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">6.5</a></li>
     1578                  <li class="indline1">Content-Language header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">4.1</a>, <a class="iref" href="#rfc.iref.c.3"><b>6.6</b></a></li>
     1579                  <li class="indline1">Content-Location header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-location.1">4.1</a>, <a class="iref" href="#rfc.iref.c.4"><b>6.7</b></a></li>
     1580                  <li class="indline1">Content-MD5 header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-md5.1">4.1</a>, <a class="iref" href="#rfc.iref.c.5"><b>6.8</b></a></li>
     1581                  <li class="indline1">Content-Type header&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-type.1">3.3</a>, <a class="iref" href="#rfc.xref.header.content-type.2">4.1</a>, <a class="iref" href="#rfc.iref.c.6"><b>6.9</b></a></li>
    15671582                  <li class="indline1">Content-Version header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.c.8"><b>C.1</b></a></li>
    15681583               </ul>
    15691584            </li>
    15701585            <li class="indline0"><a id="rfc.index.D" href="#rfc.index.D"><b>D</b></a><ul class="ind">
    1571                   <li class="indline1">deflate&nbsp;&nbsp;<a class="iref" href="#rfc.iref.d.1">2.2</a></li>
     1586                  <li class="indline1">deflate&nbsp;&nbsp;<a class="iref" href="#rfc.iref.d.1">3.2</a></li>
    15721587                  <li class="indline1">Derived-From header&nbsp;&nbsp;<a class="iref" href="#rfc.iref.d.2"><b>C.1</b></a></li>
    15731588               </ul>
     
    15761591                  <li class="indline1"><tt>Grammar</tt>&nbsp;&nbsp;
    15771592                     <ul class="ind">
    1578                         <li class="indline1"><tt>Accept</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.17"><b>5.1</b></a></li>
    1579                         <li class="indline1"><tt>Accept-Charset</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.21"><b>5.2</b></a></li>
    1580                         <li class="indline1"><tt>Accept-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.22"><b>5.3</b></a></li>
    1581                         <li class="indline1"><tt>accept-extension</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.20"><b>5.1</b></a></li>
    1582                         <li class="indline1"><tt>Accept-Language</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.24"><b>5.4</b></a></li>
    1583                         <li class="indline1"><tt>accept-params</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.19"><b>5.1</b></a></li>
    1584                         <li class="indline1"><tt>attribute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>2.3</b></a></li>
    1585                         <li class="indline1"><tt>charset</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.1"><b>2.1</b></a></li>
    1586                         <li class="indline1"><tt>codings</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.23"><b>5.3</b></a></li>
    1587                         <li class="indline1"><tt>content-coding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>2.2</b></a></li>
     1593                        <li class="indline1"><tt>Accept</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.17"><b>6.1</b></a></li>
     1594                        <li class="indline1"><tt>Accept-Charset</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.21"><b>6.2</b></a></li>
     1595                        <li class="indline1"><tt>Accept-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.22"><b>6.3</b></a></li>
     1596                        <li class="indline1"><tt>accept-extension</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.20"><b>6.1</b></a></li>
     1597                        <li class="indline1"><tt>Accept-Language</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.24"><b>6.4</b></a></li>
     1598                        <li class="indline1"><tt>accept-params</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.19"><b>6.1</b></a></li>
     1599                        <li class="indline1"><tt>attribute</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.8"><b>3.3</b></a></li>
     1600                        <li class="indline1"><tt>charset</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.1"><b>3.1</b></a></li>
     1601                        <li class="indline1"><tt>codings</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.23"><b>6.3</b></a></li>
     1602                        <li class="indline1"><tt>content-coding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.2"><b>3.2</b></a></li>
    15881603                        <li class="indline1"><tt>content-disposition</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.33"><b>B.1</b></a></li>
    1589                         <li class="indline1"><tt>Content-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.26"><b>5.5</b></a></li>
    1590                         <li class="indline1"><tt>Content-Language</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.27"><b>5.6</b></a></li>
    1591                         <li class="indline1"><tt>Content-Location</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.28"><b>5.7</b></a></li>
    1592                         <li class="indline1"><tt>Content-MD5</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.29"><b>5.8</b></a></li>
    1593                         <li class="indline1"><tt>Content-Type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.31"><b>5.9</b></a></li>
     1604                        <li class="indline1"><tt>Content-Encoding</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.26"><b>6.5</b></a></li>
     1605                        <li class="indline1"><tt>Content-Language</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.27"><b>6.6</b></a></li>
     1606                        <li class="indline1"><tt>Content-Location</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.28"><b>6.7</b></a></li>
     1607                        <li class="indline1"><tt>Content-MD5</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.29"><b>6.8</b></a></li>
     1608                        <li class="indline1"><tt>Content-Type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.31"><b>6.9</b></a></li>
    15941609                        <li class="indline1"><tt>disp-extension-parm</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.38"><b>B.1</b></a></li>
    15951610                        <li class="indline1"><tt>disp-extension-token</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.37"><b>B.1</b></a></li>
    15961611                        <li class="indline1"><tt>disposition-parm</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.35"><b>B.1</b></a></li>
    15971612                        <li class="indline1"><tt>disposition-type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.34"><b>B.1</b></a></li>
    1598                         <li class="indline1"><tt>entity-body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.16"><b>3.2</b></a></li>
    1599                         <li class="indline1"><tt>entity-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.14"><b>3.1</b></a></li>
    1600                         <li class="indline1"><tt>extension-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.15"><b>3.1</b></a></li>
     1613                        <li class="indline1"><tt>entity-body</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.16"><b>4.2</b></a></li>
     1614                        <li class="indline1"><tt>entity-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.14"><b>4.1</b></a></li>
     1615                        <li class="indline1"><tt>extension-header</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.15"><b>4.1</b></a></li>
    16011616                        <li class="indline1"><tt>filename-parm</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.36"><b>B.1</b></a></li>
    1602                         <li class="indline1"><tt>language-range</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.25"><b>5.4</b></a></li>
    1603                         <li class="indline1"><tt>language-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.11"><b>2.5</b></a></li>
    1604                         <li class="indline1"><tt>md5-digest</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.30"><b>5.8</b></a></li>
    1605                         <li class="indline1"><tt>media-range</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.18"><b>5.1</b></a></li>
    1606                         <li class="indline1"><tt>media-type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>2.3</b></a></li>
     1617                        <li class="indline1"><tt>language-range</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.25"><b>6.4</b></a></li>
     1618                        <li class="indline1"><tt>language-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.11"><b>3.5</b></a></li>
     1619                        <li class="indline1"><tt>md5-digest</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.30"><b>6.8</b></a></li>
     1620                        <li class="indline1"><tt>media-range</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.18"><b>6.1</b></a></li>
     1621                        <li class="indline1"><tt>media-type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.4"><b>3.3</b></a></li>
    16071622                        <li class="indline1"><tt>MIME-Version</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.32"><b>A.1</b></a></li>
    1608                         <li class="indline1"><tt>parameter</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>2.3</b></a></li>
    1609                         <li class="indline1"><tt>primary-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.12"><b>2.5</b></a></li>
    1610                         <li class="indline1"><tt>qvalue</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.10"><b>2.4</b></a></li>
    1611                         <li class="indline1"><tt>subtag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.13"><b>2.5</b></a></li>
    1612                         <li class="indline1"><tt>subtype</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>2.3</b></a></li>
    1613                         <li class="indline1"><tt>type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>2.3</b></a></li>
    1614                         <li class="indline1"><tt>value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>2.3</b></a></li>
     1623                        <li class="indline1"><tt>parameter</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.7"><b>3.3</b></a></li>
     1624                        <li class="indline1"><tt>primary-tag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.12"><b>3.5</b></a></li>
     1625                        <li class="indline1"><tt>qvalue</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.10"><b>3.4</b></a></li>
     1626                        <li class="indline1"><tt>subtag</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.13"><b>3.5</b></a></li>
     1627                        <li class="indline1"><tt>subtype</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.6"><b>3.3</b></a></li>
     1628                        <li class="indline1"><tt>type</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.5"><b>3.3</b></a></li>
     1629                        <li class="indline1"><tt>value</tt>&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.9"><b>3.3</b></a></li>
    16151630                     </ul>
    16161631                  </li>
    1617                   <li class="indline1">gzip&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3">2.2</a></li>
     1632                  <li class="indline1">gzip&nbsp;&nbsp;<a class="iref" href="#rfc.iref.g.3">3.2</a></li>
    16181633               </ul>
    16191634            </li>
     
    16211636                  <li class="indline1">Headers&nbsp;&nbsp;
    16221637                     <ul class="ind">
    1623                         <li class="indline1">Accept&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept.1">2.3</a>, <a class="iref" href="#rfc.xref.header.accept.2">4.1</a>, <a class="iref" href="#rfc.iref.h.1"><b>5.1</b></a></li>
    1624                         <li class="indline1">Accept-Charset&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-charset.1">4.1</a>, <a class="iref" href="#rfc.iref.h.2"><b>5.2</b></a>, <a class="iref" href="#rfc.xref.header.accept-charset.2">C.1</a></li>
    1625                         <li class="indline1">Accept-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-encoding.1">2.2</a>, <a class="iref" href="#rfc.xref.header.accept-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.h.3"><b>5.3</b></a></li>
    1626                         <li class="indline1">Accept-Language&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-language.1">4.1</a>, <a class="iref" href="#rfc.iref.h.4"><b>5.4</b></a></li>
     1638                        <li class="indline1">Accept&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept.1">3.3</a>, <a class="iref" href="#rfc.xref.header.accept.2">5.1</a>, <a class="iref" href="#rfc.iref.h.1"><b>6.1</b></a></li>
     1639                        <li class="indline1">Accept-Charset&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-charset.1">5.1</a>, <a class="iref" href="#rfc.iref.h.2"><b>6.2</b></a>, <a class="iref" href="#rfc.xref.header.accept-charset.2">C.1</a></li>
     1640                        <li class="indline1">Accept-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.accept-encoding.2">5.1</a>, <a class="iref" href="#rfc.iref.h.3"><b>6.3</b></a></li>
     1641                        <li class="indline1">Accept-Language&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.accept-language.1">5.1</a>, <a class="iref" href="#rfc.iref.h.4"><b>6.4</b></a></li>
    16271642                        <li class="indline1">Alternate&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.11"><b>C.1</b></a></li>
    16281643                        <li class="indline1">Content-Base&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.17"><b>C.1</b></a></li>
    1629                         <li class="indline1">Content-Disposition&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">7.2</a>, <a class="iref" href="#rfc.iref.h.10"><b>B.1</b></a></li>
    1630                         <li class="indline1">Content-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">2.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">3.1</a>, <a class="iref" href="#rfc.iref.h.5"><b>5.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">5.5</a></li>
    1631                         <li class="indline1">Content-Language&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">3.1</a>, <a class="iref" href="#rfc.iref.h.6"><b>5.6</b></a></li>
    1632                         <li class="indline1">Content-Location&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-location.1">3.1</a>, <a class="iref" href="#rfc.iref.h.7"><b>5.7</b></a></li>
    1633                         <li class="indline1">Content-MD5&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-md5.1">3.1</a>, <a class="iref" href="#rfc.iref.h.8"><b>5.8</b></a></li>
    1634                         <li class="indline1">Content-Type&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-type.1">2.3</a>, <a class="iref" href="#rfc.xref.header.content-type.2">3.1</a>, <a class="iref" href="#rfc.iref.h.9"><b>5.9</b></a></li>
     1644                        <li class="indline1">Content-Disposition&nbsp;&nbsp;<a class="iref" href="#rfc.xref.content-disposition.1">8.2</a>, <a class="iref" href="#rfc.iref.h.10"><b>B.1</b></a></li>
     1645                        <li class="indline1">Content-Encoding&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-encoding.1">3.2</a>, <a class="iref" href="#rfc.xref.header.content-encoding.2">4.1</a>, <a class="iref" href="#rfc.iref.h.5"><b>6.5</b></a>, <a class="iref" href="#rfc.xref.header.content-encoding.3">6.5</a></li>
     1646                        <li class="indline1">Content-Language&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-language.1">4.1</a>, <a class="iref" href="#rfc.iref.h.6"><b>6.6</b></a></li>
     1647                        <li class="indline1">Content-Location&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-location.1">4.1</a>, <a class="iref" href="#rfc.iref.h.7"><b>6.7</b></a></li>
     1648                        <li class="indline1">Content-MD5&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-md5.1">4.1</a>, <a class="iref" href="#rfc.iref.h.8"><b>6.8</b></a></li>
     1649                        <li class="indline1">Content-Type&nbsp;&nbsp;<a class="iref" href="#rfc.xref.header.content-type.1">3.3</a>, <a class="iref" href="#rfc.xref.header.content-type.2">4.1</a>, <a class="iref" href="#rfc.iref.h.9"><b>6.9</b></a></li>
    16351650                        <li class="indline1">Content-Version&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.12"><b>C.1</b></a></li>
    16361651                        <li class="indline1">Derived-From&nbsp;&nbsp;<a class="iref" href="#rfc.iref.h.13"><b>C.1</b></a></li>
     
    16431658            </li>
    16441659            <li class="indline0"><a id="rfc.index.I" href="#rfc.index.I"><b>I</b></a><ul class="ind">
    1645                   <li class="indline1">identity&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.1">2.2</a></li>
    1646                   <li class="indline1"><em>ISO-8859-1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.ISO-8859-1.1">2.1.1</a>, <a class="iref" href="#ISO-8859-1"><b>9.1</b></a></li>
     1660                  <li class="indline1">identity&nbsp;&nbsp;<a class="iref" href="#rfc.iref.i.1">3.2</a></li>
     1661                  <li class="indline1"><em>ISO-8859-1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.ISO-8859-1.1">3.1.1</a>, <a class="iref" href="#ISO-8859-1"><b>10.1</b></a></li>
    16471662               </ul>
    16481663            </li>
     
    16521667            </li>
    16531668            <li class="indline0"><a id="rfc.index.P" href="#rfc.index.P"><b>P</b></a><ul class="ind">
    1654                   <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">3.1</a>, <a class="iref" href="#rfc.xref.Part1.2">3.2</a>, <a class="iref" href="#rfc.xref.Part1.3">3.2.2</a>, <a class="iref" href="#Part1"><b>9.1</b></a>, <a class="iref" href="#rfc.xref.Part1.4">A.5</a>, <a class="iref" href="#rfc.xref.Part1.5">C.1</a><ul class="ind">
    1655                         <li class="indline1"><em>Section 4.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.2">3.2</a></li>
    1656                         <li class="indline1"><em>Section 4.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.3">3.2.2</a></li>
    1657                         <li class="indline1"><em>Section 8.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">3.1</a></li>
    1658                         <li class="indline1"><em>Section 8.7</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.4">A.5</a></li>
     1669                  <li class="indline1"><em>Part1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">2</a>, <a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a>, <a class="iref" href="#rfc.xref.Part1.8">4.1</a>, <a class="iref" href="#rfc.xref.Part1.9">4.2</a>, <a class="iref" href="#rfc.xref.Part1.10">4.2.2</a>, <a class="iref" href="#Part1"><b>10.1</b></a>, <a class="iref" href="#rfc.xref.Part1.11">A.5</a>, <a class="iref" href="#rfc.xref.Part1.12">C.1</a><ul class="ind">
     1670                        <li class="indline1"><em>Section 2.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.1">2</a></li>
     1671                        <li class="indline1"><em>Section 2.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.2">2</a>, <a class="iref" href="#rfc.xref.Part1.3">2</a>, <a class="iref" href="#rfc.xref.Part1.4">2</a>, <a class="iref" href="#rfc.xref.Part1.5">2</a>, <a class="iref" href="#rfc.xref.Part1.6">2</a>, <a class="iref" href="#rfc.xref.Part1.7">2</a></li>
     1672                        <li class="indline1"><em>Section 4.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.9">4.2</a></li>
     1673                        <li class="indline1"><em>Section 4.4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.10">4.2.2</a></li>
     1674                        <li class="indline1"><em>Section 8.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.8">4.1</a></li>
     1675                        <li class="indline1"><em>Section 8.7</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part1.11">A.5</a></li>
    16591676                     </ul>
    16601677                  </li>
    1661                   <li class="indline1"><em>Part2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">3.1</a>, <a class="iref" href="#rfc.xref.Part2.2">4.1</a>, <a class="iref" href="#Part2"><b>9.1</b></a><ul class="ind">
    1662                         <li class="indline1"><em>Section 9.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">3.1</a></li>
    1663                         <li class="indline1"><em>Section 9.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.2">4.1</a></li>
     1678                  <li class="indline1"><em>Part2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">4.1</a>, <a class="iref" href="#rfc.xref.Part2.2">5.1</a>, <a class="iref" href="#Part2"><b>10.1</b></a><ul class="ind">
     1679                        <li class="indline1"><em>Section 10.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.1">4.1</a></li>
     1680                        <li class="indline1"><em>Section 10.9</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part2.2">5.1</a></li>
    16641681                     </ul>
    16651682                  </li>
    1666                   <li class="indline1"><em>Part4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part4.1">3.1</a>, <a class="iref" href="#Part4"><b>9.1</b></a><ul class="ind">
    1667                         <li class="indline1"><em>Section 6.6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part4.1">3.1</a></li>
     1683                  <li class="indline1"><em>Part4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part4.1">4.1</a>, <a class="iref" href="#Part4"><b>10.1</b></a><ul class="ind">
     1684                        <li class="indline1"><em>Section 7.6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part4.1">4.1</a></li>
    16681685                     </ul>
    16691686                  </li>
    1670                   <li class="indline1"><em>Part5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">2.3.2</a>, <a class="iref" href="#rfc.xref.Part5.2">3.1</a>, <a class="iref" href="#Part5"><b>9.1</b></a>, <a class="iref" href="#rfc.xref.Part5.3">C.1</a><ul class="ind">
    1671                         <li class="indline1"><em>Section 5.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.2">3.1</a></li>
    1672                         <li class="indline1"><em>Section A</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">2.3.2</a></li>
     1687                  <li class="indline1"><em>Part5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">3.3.2</a>, <a class="iref" href="#rfc.xref.Part5.2">4.1</a>, <a class="iref" href="#Part5"><b>10.1</b></a>, <a class="iref" href="#rfc.xref.Part5.3">C.1</a><ul class="ind">
     1688                        <li class="indline1"><em>Section 6.2</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.2">4.1</a></li>
     1689                        <li class="indline1"><em>Section A</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part5.1">3.3.2</a></li>
    16731690                     </ul>
    16741691                  </li>
    1675                   <li class="indline1"><em>Part6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">3.1</a>, <a class="iref" href="#rfc.xref.Part6.2">4.1</a>, <a class="iref" href="#rfc.xref.Part6.3">5.7</a>, <a class="iref" href="#Part6"><b>9.1</b></a>, <a class="iref" href="#rfc.xref.Part6.4">C.1</a><ul class="ind">
    1676                         <li class="indline1"><em>Section 7</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.3">5.7</a></li>
    1677                         <li class="indline1"><em>Section 15.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">3.1</a></li>
    1678                         <li class="indline1"><em>Section 15.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.2">4.1</a></li>
     1692                  <li class="indline1"><em>Part6</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">4.1</a>, <a class="iref" href="#rfc.xref.Part6.2">5.1</a>, <a class="iref" href="#rfc.xref.Part6.3">6.7</a>, <a class="iref" href="#Part6"><b>10.1</b></a>, <a class="iref" href="#rfc.xref.Part6.4">C.1</a><ul class="ind">
     1693                        <li class="indline1"><em>Section 8</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.3">6.7</a></li>
     1694                        <li class="indline1"><em>Section 16.3</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.1">4.1</a></li>
     1695                        <li class="indline1"><em>Section 16.5</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.Part6.2">5.1</a></li>
    16791696                     </ul>
    16801697                  </li>
     
    16831700            </li>
    16841701            <li class="indline0"><a id="rfc.index.R" href="#rfc.index.R"><b>R</b></a><ul class="ind">
    1685                   <li class="indline1"><em>RFC1766</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1766.1">2.5</a>, <a class="iref" href="#RFC1766"><b>9.1</b></a></li>
    1686                   <li class="indline1"><em>RFC1806</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1806.1">7.2</a>, <a class="iref" href="#rfc.xref.RFC1806.2">7.2</a>, <a class="iref" href="#RFC1806"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC1806.3">B.1</a></li>
    1687                   <li class="indline1"><em>RFC1864</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1864.1">5.8</a>, <a class="iref" href="#rfc.xref.RFC1864.2">5.8</a>, <a class="iref" href="#RFC1864"><b>9.1</b></a></li>
    1688                   <li class="indline1"><em>RFC1945</em>&nbsp;&nbsp;<a class="iref" href="#RFC1945"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC1945.1">B</a></li>
    1689                   <li class="indline1"><em>RFC1950</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1950.1">2.2</a>, <a class="iref" href="#RFC1950"><b>9.1</b></a></li>
    1690                   <li class="indline1"><em>RFC1951</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1951.1">2.2</a>, <a class="iref" href="#RFC1951"><b>9.1</b></a></li>
    1691                   <li class="indline1"><em>RFC1952</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1952.1">2.2</a>, <a class="iref" href="#RFC1952"><b>9.1</b></a></li>
    1692                   <li class="indline1"><em>RFC2045</em>&nbsp;&nbsp;<a class="iref" href="#RFC2045"><b>9.1</b></a>, <a class="iref" href="#rfc.xref.RFC2045.1">A</a>, <a class="iref" href="#rfc.xref.RFC2045.2">A.1</a>, <a class="iref" href="#rfc.xref.RFC2045.3">A.2</a></li>
    1693                   <li class="indline1"><em>RFC2046</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2046.1">2.3</a>, <a class="iref" href="#rfc.xref.RFC2046.2">2.3.2</a>, <a class="iref" href="#RFC2046"><b>9.1</b></a>, <a class="iref" href="#rfc.xref.RFC2046.3">A.2</a><ul class="ind">
    1694                         <li class="indline1"><em>Section 5.1.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2046.2">2.3.2</a></li>
     1702                  <li class="indline1"><em>RFC1766</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1766.1">3.5</a>, <a class="iref" href="#RFC1766"><b>10.1</b></a></li>
     1703                  <li class="indline1"><em>RFC1806</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1806.1">8.2</a>, <a class="iref" href="#rfc.xref.RFC1806.2">8.2</a>, <a class="iref" href="#RFC1806"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC1806.3">B.1</a></li>
     1704                  <li class="indline1"><em>RFC1864</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1864.1">6.8</a>, <a class="iref" href="#rfc.xref.RFC1864.2">6.8</a>, <a class="iref" href="#RFC1864"><b>10.1</b></a></li>
     1705                  <li class="indline1"><em>RFC1945</em>&nbsp;&nbsp;<a class="iref" href="#RFC1945"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC1945.1">B</a></li>
     1706                  <li class="indline1"><em>RFC1950</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1950.1">3.2</a>, <a class="iref" href="#RFC1950"><b>10.1</b></a></li>
     1707                  <li class="indline1"><em>RFC1951</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1951.1">3.2</a>, <a class="iref" href="#RFC1951"><b>10.1</b></a></li>
     1708                  <li class="indline1"><em>RFC1952</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC1952.1">3.2</a>, <a class="iref" href="#RFC1952"><b>10.1</b></a></li>
     1709                  <li class="indline1"><em>RFC2045</em>&nbsp;&nbsp;<a class="iref" href="#RFC2045"><b>10.1</b></a>, <a class="iref" href="#rfc.xref.RFC2045.1">A</a>, <a class="iref" href="#rfc.xref.RFC2045.2">A.1</a>, <a class="iref" href="#rfc.xref.RFC2045.3">A.2</a></li>
     1710                  <li class="indline1"><em>RFC2046</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2046.1">3.3</a>, <a class="iref" href="#rfc.xref.RFC2046.2">3.3.2</a>, <a class="iref" href="#RFC2046"><b>10.1</b></a>, <a class="iref" href="#rfc.xref.RFC2046.3">A.2</a><ul class="ind">
     1711                        <li class="indline1"><em>Section 5.1.1</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2046.2">3.3.2</a></li>
    16951712                     </ul>
    16961713                  </li>
    1697                   <li class="indline1"><em>RFC2049</em>&nbsp;&nbsp;<a class="iref" href="#RFC2049"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2049.1">A.2</a><ul class="ind">
     1714                  <li class="indline1"><em>RFC2049</em>&nbsp;&nbsp;<a class="iref" href="#RFC2049"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2049.1">A.2</a><ul class="ind">
    16981715                        <li class="indline1"><em>Section 4</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2049.1">A.2</a></li>
    16991716                     </ul>
    17001717                  </li>
    1701                   <li class="indline1"><em>RFC2068</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.1">§</a>, <a class="iref" href="#rfc.xref.RFC2068.2">§</a>, <a class="iref" href="#rfc.xref.RFC2068.3">§</a>, <a class="iref" href="#RFC2068"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2068.4">B</a>, <a class="iref" href="#rfc.xref.RFC2068.5">C.1</a></li>
    1702                   <li class="indline1"><em>RFC2076</em>&nbsp;&nbsp;<a class="iref" href="#RFC2076"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2076.1">B</a></li>
    1703                   <li class="indline1"><em>RFC2119</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2119.1">1.1</a>, <a class="iref" href="#RFC2119"><b>9.1</b></a></li>
    1704                   <li class="indline1"><em>RFC2183</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2183.1">7.2</a>, <a class="iref" href="#RFC2183"><b>9.2</b></a></li>
    1705                   <li class="indline1"><em>RFC2277</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2277.1">2.1</a>, <a class="iref" href="#RFC2277"><b>9.2</b></a></li>
    1706                   <li class="indline1"><em>RFC2388</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2388.1">2.3.2</a>, <a class="iref" href="#RFC2388"><b>9.2</b></a></li>
    1707                   <li class="indline1"><em>RFC2557</em>&nbsp;&nbsp;<a class="iref" href="#RFC2557"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2557.1">A.6</a>, <a class="iref" href="#rfc.xref.RFC2557.2">C.1</a></li>
    1708                   <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#RFC2616"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.2">D.1</a></li>
    1709                   <li class="indline1"><em>RFC2822</em>&nbsp;&nbsp;<a class="iref" href="#RFC2822"><b>9.2</b></a>, <a class="iref" href="#rfc.xref.RFC2822.1">A</a></li>
    1710                   <li class="indline1"><em>RFC3629</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC3629.1">2.1</a>, <a class="iref" href="#RFC3629"><b>9.2</b></a></li>
    1711                   <li class="indline1"><em>RFC4288</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC4288.1">2.3</a>, <a class="iref" href="#RFC4288"><b>9.2</b></a></li>
     1718                  <li class="indline1"><em>RFC2068</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2068.1">§</a>, <a class="iref" href="#rfc.xref.RFC2068.2">§</a>, <a class="iref" href="#rfc.xref.RFC2068.3">§</a>, <a class="iref" href="#RFC2068"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2068.4">B</a>, <a class="iref" href="#rfc.xref.RFC2068.5">C.1</a></li>
     1719                  <li class="indline1"><em>RFC2076</em>&nbsp;&nbsp;<a class="iref" href="#RFC2076"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2076.1">B</a></li>
     1720                  <li class="indline1"><em>RFC2119</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2119.1">1.1</a>, <a class="iref" href="#RFC2119"><b>10.1</b></a></li>
     1721                  <li class="indline1"><em>RFC2183</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2183.1">8.2</a>, <a class="iref" href="#RFC2183"><b>10.2</b></a></li>
     1722                  <li class="indline1"><em>RFC2277</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2277.1">3.1</a>, <a class="iref" href="#RFC2277"><b>10.2</b></a></li>
     1723                  <li class="indline1"><em>RFC2388</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2388.1">3.3.2</a>, <a class="iref" href="#RFC2388"><b>10.2</b></a></li>
     1724                  <li class="indline1"><em>RFC2557</em>&nbsp;&nbsp;<a class="iref" href="#RFC2557"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2557.1">A.6</a>, <a class="iref" href="#rfc.xref.RFC2557.2">C.1</a></li>
     1725                  <li class="indline1"><em>RFC2616</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC2616.1">1</a>, <a class="iref" href="#RFC2616"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2616.2">D.1</a></li>
     1726                  <li class="indline1"><em>RFC2822</em>&nbsp;&nbsp;<a class="iref" href="#RFC2822"><b>10.2</b></a>, <a class="iref" href="#rfc.xref.RFC2822.1">A</a></li>
     1727                  <li class="indline1"><em>RFC3629</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC3629.1">3.1</a>, <a class="iref" href="#RFC3629"><b>10.2</b></a></li>
     1728                  <li class="indline1"><em>RFC4288</em>&nbsp;&nbsp;<a class="iref" href="#rfc.xref.RFC4288.1">3.3</a>, <a class="iref" href="#RFC4288"><b>10.2</b></a></li>
    17121729               </ul>
    17131730            </li>
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